题目内容

London ________the 2012 Olympic Games.

A. hold
B. holds
C. is holding
D. held

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--- Did your father work inAmericain 2000?--- _________. He worked inAustralia.

A. No, he doesn't
B. Yes, he does
C. No, he didn't
D. Yes, he did

What _she__ for breakfast?

A. did;did
B. do;had
C. did;have
D. do;has

利用材料的强度条件，可解决三大类工程实际问题：校核强度、求最小截面积、确定。

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