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【单选题】
质量为1kg的物体，从坐标原点静止开始出发，在水平面内沿x轴正向运动，其所受合力方向与运动方向相同，合力大小为F=3+2x（SI制），物体在开始运动的3m内，合力所作的功是（）。A.
16J
B.
18J
C.
20J
D.
24J
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【简答题】生产者众多，各种生产资料可以完全流动的市场属于（ ）市场。
【单选题】Did you tell your mother all ___ you had seen on the way home?
A.
that
B.
what
C.
why
D.
how
【单选题】--- You didn’t tell your parents the date of our graduation ceremony, did you? --- No, but I ____. My sister had told them.
A.
didn’t need to
B.
needn’t have
C.
couldn’t have
D.
shouldn’t
【单选题】— I’m sorry to tell you that you made a mistake in your test. — How can that be? I did it _______ in class.
A.
as told
B.
as am told
C.
as telling
D.
as I told
【单选题】—Did you tell your headmaster that the teachers and students had a number of ________ their lunch? —Yes. He said he must solve this problem.
A.
complains about
B.
complaints of
C.
complaints about D complaints of
【单选题】许多企业生产同质产品，生产者众多，各种生产资料可以完全流动，市场信息畅通，生产者和消费者可以自由进入和退出市场，企业永远是价格的接受者而不是价格的制定者。这些描 述属于( )的特点。
A.
完全竞争行业
B.
完全垄断行业
C.
垄断竞争行业
D.
寡头垄断行业
【简答题】生产者众多，各种生产资料可以完全流动的市场属于（ ）市场。
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