题目内容
（请给出正确答案）
A.never been turned on yet
B.been the biggest scientific instrument
C.done nothing to look for the gravitational waves
D.found no gravitational waves
答案
D、found no gravitational waves
解析：解析： 答案可以从第5段的最后一句But so far the $400-million machine has not seen anything中推出。
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更多“Until now LIGO has ______.”相关的问题
Up until now, Queen Elizabeth has ruled in Britain for over __________ decades.
A.three
B.four
C.five
D.six
The price for raw materials remained constant throughout the year at $1·20 per kg. Similarly, the direct labour cost for the whole workforce was $14·80 per hour. The annual overhead costs were as follows:
Required:
(a) Calculate the full cost per unit for products A, B and C under traditional absorption costing, using direct labour hours as the basis for apportionment. (5 marks)
(b) Calculate the full cost per unit of each product using activity based costing. (9 marks)
(c) Using your calculation from (a) and (b) above, explain how activity based costing may help The Gadget Co improve the profitability of each product. (6 marks)
A.the life—saving ways are medically effective
B.their parents are rich enough for the life—saving techniques
C.rite life—saving techniques are easy to use
D.their parents learn the life—saving techniques
According to the passage，it is now quite usual for women to__________ ．
A.stay at home after leaving school
B.marry men younger than themselves
C.start work until retirement at 60
D.marry while still at school
in a space level (i.e. the complement of a mark) for one element period. This element is called the start bit and has a duration of T seconds. The transmitter then sends the character, l bit at a time, by placing each successive bit on the line for a duration of T seconds, until all bits have been transmitted. Then a single parity bit is calculated by the transmitter and sent after the data bits. Finally, the transmitter sends a stop bit at a mark level (i.e. the same level as the idle state) for one or two bit periods. Now the transmitter may send another character whenever it wishes.
At the receiving end of an asynchronous serial data link, the receiver continually monitors the line looking for a start bit. Once the start bit has been detected, the receiver waits until the end of the start bit and then samples the next N bits at their centers, using a clock generated locally by the receiver. As each incoming bit is sampled, it is used to construct a new character. When the received character has been assembled, its parity is calculated and compared with the received parity bit following the character. If they are not equal, a parity error flag is set to indicate a transmission error.
(1).When the transmitter wishes to send data, it first sends().
A.a character at the same time
B.a character to the line
C.the start bit
D.a mark level to the line
(2).The transmitter then send the character, for a duration of T seconds().
A.each bit
B.all bits
C.successive bits
D.a start bit and a character
(3).Finally, the transmitter sends a stop bit at the same level as for one or two bit periods().
A.the space level
B.the mark level
C.the complement of the mark level
D.another character
(4).At the receiving end of an asynchronous serial data link, the receiver().
A.does not monitor the start bit
B.waits until the beginning of the start bit
C.samples the start bit at its center
D.generates a local clock
(5).When the received character has been assembled, its parity().
A.is set to indicate a transmission error
B.is compared with the received character
C.is an error flag
D.may be equal to the received parity
The vaults where his money was kept had huge, steel doors with【62】locks.【63】guards with pistols in their holsters were always on【64】in the bank. The tellers cages----the cubicles 【65】the bank clerks, or tellers, worked-actually.【66】 cages. They had gratings across the front, high sides and back, and a door that could be opened only by pushing a release button.
The new style. of bank design【67】some of these【68】features, but the idea now is to make the bank【69】 like a friendly place【70】than a forbidding fortress. The modem bank buildings are open and light,【71】large glass windows and doors. The tellers' cages have been【72】by flat, unobstructed counters. The【73】and burglar alarms are still there, but they are【74】noticeable than they【75】to be.
(61)
A．and
B．but
C．that
D．what
In sport the sexes are separate. (76) Women and men do not run or swim in the same races. Women are less strong than men. That at least is what people say. Women are called "the weaker sex" ,or, if men want to please them, "the fair sex". But boys and girls are taught together at schools and universities. There are women who are famous Prime Ministers, scientists and writers. And women live longer than men. A European woman can expect to live until the age of 74, a man only until he is 68. Are women' s bodies really weaker7
The fastest men can run a mile in 4 minutes. The best women need 4.5 minutes. Women' s speeds are always slower than men' s, but some facts are surpising. Some of the fastest women swimmers today are teenage girls. One of them swam 400 metres in 4 minutes 21.2 seconds when she was only 16. The first "Tarzan" in films was an Olympic swimmer, Johnny Weissmuller. His fastest 400 metres was 4 minutes 59.1 seconds, which is 37.9 seconds slower than a girl 50 years later! This does not mean that women are catching men up. Conditions are very different now, and sport is much more serious. It is so serious that some women athletes are given hormone(荷尔蒙) injections. At the Olympics a doctor has to check whether the women athletes are really women or not. It seems sad that sport has such problem. Life can be very complicated when there are two separate sexes !
Women are called "the weaker sex" because______.
A．women do as much work as men
B．people think women are weaker than men
C．sport is easier for men than for women
D．in sport the two sexes are always together
ace level (i.e. the complement of a mark) for one element period. This element is called the start bit and has a duration of T seconds. The transmitter then sends the character, l bit at a time, by placing each successive bit on the line for a duration of T seconds, until all bits have been transmitted. Then a single parity bit is calculated by the transmitter and sent after the data bits. Finally, the transmitter sends a stop bit at a mark level (i.e. the same level as the idle state) for one or two bit periods. Now the transmitter may send another character whenever it wishes.
At the receiving end of an asynchronous serial data link, the receiver continually monitors the line looking for a start bit. Once the start bit has been detected, the receiver waits until the end of the start bit and then samples the next N bits at their centers, using a clock generated locally by the receiver. As each incoming bit is sampled, it is used to construct a new character. When the received character has been assembled, its parity is calculated and compared with the received parity bit following the character. If they are not equal, a parity error flag is set to indicate a transmission error.
(1).When the transmitter wishes to send data, it first ().
A.places the line in a space level
B.puts the line in a mark level
C.sends a stop bit
D.places a bit at logical l level
(2).Then a single parity bit is calculated by the transmitter and ().
A.compared with the received parity bit
B.sent with the data bits
C.sent after the data bits
D.sent before the data bits
(3).At the receiving end of an asynchronous serial data link, the receiver continually monitors the line().
A.waiting for the end of the start bit
B.looking for a start bit
C.generating a clock
D.constructing a new character
(4).When the transmitter wishes to send data , it first sends().
A.a character at the same time
B.a character to the line
C.the start bit
D.a mark level to the line
(5).The transmitter then send the character, for a duration of T seconds().
A.each bit
B.all bits
C.successive bits
D.a start bit and a character
After she graduated from high school, Mrs. Cox went on to college. Four years later, she received her bachelor's degree (B. A. ) in English and her teaching certificate. Then she was qualified to teach in the secondary schools of her state. In the summers, Mrs. Cox takes more classes. Someday she hopes to get a master's degree (M. A. ). With an M. A. , she will receive a higher salary.
The school day at Mrs. Cox's high school, like that in many high schools in the United States, is divided into six periods of one hour each. Mrs. Cox must teach five of these six periods. During her free period, which for her is from 2 to 3 p.m. , Mrs. Cox must meet with parents, order supplies, make out examinations, check assignments, and take care of many other things. In short, her free period isn't really free at all. Mrs. Cox works steadily from the time she arrives at school in the morning until the time she leaves for home late in the afternoon.
Mrs. Cox wants to be a teacher because______.
A．she likes teaching
B．she is a young girl
C．she has many problems to deal with
D．she doesn't mind what she is doing
You can' t entirely blame men for this change in manners. The days are gone when women could be treated as the weaker sex. A whole generation of women has grown up demanding equality with men; not just equality in jobs or education, but in social attitudes. Hold a door open for some women and you're likely to get an angry lecture on treating women as inferiors, unable to open doors for themselves. Take a girl out for a meal and she'll probably insist on paying her share of the bill.
It' s no wonder, then, that men have given up some of the gestures of politeness and consideration which they used to show towards women. On the other hand, man' s politeness is perhaps slowly being replaced by true consideration for the needs and feelings of women, so that men can see women as equal human beings.
What do gentlemen now do when a lady gets on a crowded bus or train？
A．They will stand up reluctantly.
B．They will offer her their seats after a while.
C．They will pretend not to see her.
D．They will get off the bus.
