A.产生61°反射时,纵波入射角与横波反射角之和为90°
B.产生61°反射时,纵波入射角为61°,横波反射角为29°
C.产生61°反射时,横波入射角为29°,纵波反射角为61°
D.产生61°反射时,其声程是恒定的
(61)
A.this
B.some
C.a
D.that
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
【65】 newspapers regularly print letters 【66】 readers with problems. Along 【67】 the letters there are answers written 【68】 people who are supposed to know how to 【69】 such problems. Some of these writers are doctors; 【70】 are lawyers or educators. But two of the most famous writers of advice 【71】women without special training 【72】 this kind of work. One of them answers letters 【73】 to " Dear Abby". The other is addressed 【74】 " Dear Ann Landers". Experience is their preparation for 【75】 advice.
There is one writer who has not lived long 【76】 to have much experience. She is a girl named Angel Cavaliere, who started writing 【77】 for newspaper readers 【78】 the age of ten. Her advice to young readers now 【79】 regularly in the Philadelphia Bulletin in a column 【80】 DEAR ANGEL.
(61)
A.talk
B.ask
C.tell
D.speak
Both these types are entirely different【61】their behavior. The man who【62】is always talking about his"【63】"; he thinks that society should【64】him a pleasant, easy life. The man (who is always doing more than【65】) talks of "duties" ; he feels that the 【66】is in debt to society.
The man who tries to do as【67】as he can is always full of【68】. For instance, if he has【69】to do something, it was because he was【70】by bad luck. His opposite is never【71】 busy to take on a (an)【72】piece of work. So it is【73】that if you want something【74】in a hurry, go to the busiest man whom you have【75】in.
(36)
A.in
B.by
C.as
D.of
Professors should be【66】from reading lecture notes. " It makes their【67】monotonous
If they are going to read, why not【68】out copies of the lecture? Then we【69】need to go to class. Professors should【70】repeating lectures material that is in the textbook.【71】we've read the material, we want to【72】it or hear it elaborated on,【73】repeated. "A lot of students hate to buy a【74】text that the professor has written【75】to have his lectures repeat it.
(56)
A.involving
B.counting
C.covering
D.figuring
【61】thing that man can do is to limit the【62】of babies born. The need【63】this is obvious, but it is not【64】to achieve. People have to be【65】to limit their families. In the countries of the population【66】, many people like big families. The parents think that this【67】a bigger income for the family and ensures there will be someone in the family who will look【68】them in old age.
Several governments have【69】birth control policies in recent years.【70】them are Japan, China, India and Egypt. In some【71】the results have not been successful. Japan has been an【72】. The Japanese adopted a birth control policy in 1948. People were【73】to limit their families. The birth【74】fell from 34.3 per thousand per year to about 17.0 per year【75】present.
(46)
A.second
B.recent
C.next
D.late
We【65】our children to school to【66】them for the time【67】they will be big and will have to work【68】themselves. Nearly all they study at school has some【69】use in their life, but is that the only reason【70】they go to school?
There is【71】in education than just learning facts. We go to school【72】all to learn how to learn,【73】when we have【74】school we can continue to learn. A man who really knows【75】will always be successful, because【76】he has to do something new which he. Has never had to do【77】, he will rapidly teach himself how to do it in the best【78】. The uneducated person,【79】, is probably unable to do something new, or does it badly. The purpose of schools, therefore, is not just to teach languages, arithmetic, etc..,【80】to teach pupils the way to learn.
(56)
A.either
B.whether
C.ever
D.as well
【68】, as soon as the great man came up he got【69】his horse, saying, "I see you've had bad luck, friend. How good it is【70】I' m here just at the【71】time. "Then he took one【72】of the sack, the farmer, the other, and between them they lifted it on the horse. "Sir, "asked the farmer, "how can I pay you?"
"Easily enough, "the great man【73】. "Whenever you see【74】else in trouble,【75】the same for him.
(56)
A.how
B.what
C.which
D.whether