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问题 选择题

沿直线作匀变速直线运动的质点在第一个0.5秒内的平均速度比它在第一个1.5秒内的平均速度大2.45m/s，以质点的运动方向为正方向，则该质点的加速度为 [ ]

A．2.45m/s2

B．－2.45m/s2

C．4.90m/s2

D．－4.90m/s2

答案

答案：D

选择题

Friendship can't be ________in terms of money but money is an effective means to ______ how

strong the friendship is.     [ ]

A. measured; test  

B. weighed; weigh  

C. measured; measure  

D. tested; measure

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选择题

Some analysts predict that slowing economic growth ________ enterprises reduce   their intake of

new workers. [ ]

A. contributes to

B. has led to

C. will cause

D. will see
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