Which of the following certificates do you have to show for cashing your checks？
A. passport
B. credit card
C. I.D.card
D. bank book
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What kind of metal did the Swiss team use to calculate the G's value？
A. gold
B. silver
C. mercury
D. lead
In order to make a stone bounce best on water, one needs to ______.
A. find a big, round stone
B. reduce the spin of the stone
C. make the stone spin as fast as possible
D. do some complicated mathematical equations
The latest study is very helpful in that ______.
A. it can take clearer pictures of teenagers' brains
B. scientists will meet with fewer, dangers in their research work
C. it may help scientists understand better the mental illness in teenagers
D. it may enable teenagers to experience fewer dangers during teenager years
The earthquake happened in south Xinjiang on Feb. This ______ killed 266 people.
A. casualty
B. collapse
C. calamity
D. crater
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