题目内容

Their answers are exactly the same — one of them ______ from the other

A.
must copy
B.
must have copied
C.
should copy
D.
should have copied

B
解析：
句意：他们的答案一模一样——他的当中一个人一定抄袭了另一个人。根据句意，抄袭这个动作发生在过去，排除A，C两项，B过去一定做了某事D本应该做某事而实际没做，故选B
考点：考查情态动词。
点评：情态动词+have done ,表示对过去的虚拟或推测。记住这些结构的意思：shouldn’t have done 本不应该做某事，实际上却做了；needn’t have done本不需要做某事，实际上却做了。can’t/couldn’ t have done不可能做了某事，

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A．your slave and serves you

B．your supporter and helps you

C．under your control and obeys you

D．under your influence and follows you

【小题2】The author intends to tell us that time _____.

A．could be regulated by a timepiece such as a clock or a watch

B．could be managed by the internal clock of human bodies

C．should be well managed for our own good

D．should be saved for outside interests

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A．how to keep up with the time	B．how to make up for lost time
C．how to have a good time	D．how to make good use of time

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A．your slave and serves you

B．your supporter and helps you

C．under your control and obeys you

D．under your influence and follows you

2.The author intends to tell us that time _____.

A．could be regulated by a timepiece such as a clock or a watch

B．could be managed by the internal clock of human bodies

C．should be well managed for our own good

D．should be saved for outside interests

3.In the next part, the author would most probably discuss with you _____.

A．how to keep up with the time B．how to make up for lost time

C．how to have a good time D．how to make good use of time

Barcodes (条形码) aren’t given much thought by the majority of consumers, but these codes were fairly recently applied in a working fashion in 1970.

A small food store owner decided one day that keeping records of the inventory (存货) of his stock and the associated prices were an extremely laborious process, and so, in 1948, he contacted the The Drexel Institute of Technology in a bid to work towards a solution. Bernard Sliver rose to the challenge and set out to study the problem, and began working on a solution involving an automatic way of keeping track of items that had been sold. Silver and a group of students from the institute realized their answer in the form of ultraviolet light (紫外线), ink and a scanner.

The system worked initially, but possessed some negatives. It was incredibly costly to carry out on a large scale and the system was also unstable. If the invention was to become commonplace (寻常的事) in grocery stores, these two problems had to be solved.

The patent (专利)for the bar code system was filed by Sliver and one of his students, Woodland. The patent was not granted immediately; in fact it took three years for the patent agency to grand their invention patent for the barcode, occurring on 7^th October, 1952.

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A．The heavy work of store owners.

B．The function of ultraviolet light, ink and a scanner.

C．The origination of barcodes

D．Bernard Silver’s education background.

2.Which of the following was NOT a drawback of Silver’s system?