题目内容

钢材的疲劳破坏属于脆性破坏。

A. 对
B. 错

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含碳量小于2％的铁碳合金称作钢，含碳量大于2％时称作铁

A. 对
B. 错

—why didn’t Tom come to school?—He _____ and hurt his leg.

A. fell down
B. fell off
C. falls down
D. fells off

Lily _____ a lie yesterday. She wasn’t hurt at all.

A. told
B. tell
C. tells
D. say

What did Kangkang do before he______the candles out?

A. blow
B. blowed
C. blew
D. blows