题目内容

Can you hear those people? What _ they __ about?

A. do, talk
B. are, talk
C. are, talking
D. do, talking

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I __________ this is your key. Am I right?

A. think
B. thinking
C. am thinking
D. thought

“How did you learn to drive?” “My father ___________ me.”

A. teaches
B. teach
C. taught
D. was teaching

Don’t put the dictionary away. I ___________ it.

A. need
B. am needing
C. was needing
D. needed

对于余隙容积、工作容积、气缸内总容积，下列说法正确的是（）

A. 气缸内总容积=工作容积+余隙容积
B. 工作容积为活塞扫过的容积
C. 余隙容积大于工作容积