"track down by following clues"Which of the following is the best translatio
A、顺藤摸瓜
B、顺着线索追捕
C、顺着线索寻找
D、以上任何一句都不恰当
A、顺藤摸瓜
B、顺着线索追捕
C、顺着线索寻找
D、以上任何一句都不恰当
The secret agent kept looking back because he was afraid of ______.
A.followed
B.being followed
C.having followed
D.having been followed
Perhaps the best way to think of our present situation is to imagine a train coming into a switchyard. All of the switches are set before the train arrives, so that its path is completely determined. Some switches we can see, others we can not. There is no ambiguity if we can see the setting of a switch: we can say with confidence that some possible futures will not materialize and others will. At the unseen switches, however, there is no such certainty. We know the train will take one of the tracks leading out, but we have no idea which one. The unseen switches are the true decision points in the future, and what happens when we arrive at them determines the entire subsequent course of events.
When we think about the future of the universe, we can see our "track" many billions of years into the future, but after that there are decision points to be dealt with and possible fates to consider. The goal of science is to reduce the ambiguity at the decision points and find the true road that will be followed.
According to the passage, it is difficult to be certain about the distant future of the universe because we ______.
A.have too many conflicting theories
B.do not have enough funding to continue our research
C.are not sure how the universe is put together
D.have focused on investigations of the moon and planets
When we think about the future of the universe, we can see our "track" many billions of years into the future, but after that there are decision points to be dealt with and possible fates to consider. The goal of science is to reduce the ambiguity at the decision points and find the true road that will be followed.
According to the passage, it is difficult to be certain about the distant future of the universe because we______.
A.have too many conflicting theories
B.do not have enough funding to continue our research
C.are not sure how the universe is put together
D.have focused our investigations on the moon and planets
The marvel of the machine age, the electronic computer has been in use only since 1946. It can do simple computations—add, subtract, multiply, and divide—with lightning speed and perfect accuracy. It can multiply two 10-digit numbers in 1/1, 000 second, a problem that would take an average person five minutes to do with pencil and paper. Some computers can work 500, 000 times faster than any person can.
Once it is given a program, that is, a carefully worked-out set of instructions devised by a technician trained in computer language, a computer can gather a wide range of information for many purposes. For the scientist it can get information from outer space or from the depths of the ocean. In business and industry the computer prepares factory inventories, keeps track of sales trends and production needs, mails dividend checks, and makes out company payrolls. It can keep bank accounts up to date and make out electric bills. If you are planning a trip by plane, the computer will find out what route to take and what space is available.
Why does the author regard the electronic computer as the marvel of the machine age?
A.Because electronic computers are rare.
B.Because people know little about electronic computers.
C.Because electronic computers can do much more kinds of work that human beings can't.
D.Because electronic computers have been widely suspected.
In Para. 3, the word "track" could best be replaced by which of the following?
A.band
B.rails
C.path
D.sequence
A.Band.
B.Rails.
C.Path.
D.Sequence.
What are the most important events in the Olympic Games?()
A.The track and field events
B.The horse-riding events
C.The swimming events
D.The boat-racing events
What athletic events were held in the first thirteen Olympic Games?
A.A great variety of events.
B.A field event only,
C.A track event only.
D.Both track and field events.
A.so that
B.and thus
C.rather than
D.but also
Computers can be used ______.
A.for entertainment and relaxation
B.to work out complex problems
C.to do any of the ten things mentioned in the reading
D.to keep track of expenses and turn appliances on and off