以36km/h的速度沿平直公路行驶的汽车，遇障碍刹车后获得大小为2m

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问题单项选择题

以36km/h的速度沿平直公路行驶的汽车，遇障碍刹车后获得大小为2m²/s的加速度。刹车后6s内，汽车走过的路程为（）

A.12m

B.18m

C.25m

D.42m

答案

参考答案：C

解析：

由即汽车从36km/h的速度以2m/s²的加速度作匀减速运动至静止的位移为25m，故C正确。

听力题

用所给词的适当形式填空

小题1:I like Love Me Once More, Mom. It’s so __________(move)

小题2:It’s very important for you _________( listen) to your teachers carefully in class.

小题3:I couldn’t fall __________( sleep) because it was too noisy outside.

小题4:These stories end with _________(happy) and laughter.

小题5:Before making an important ____________ (decide ), think it over.

小题6:She was very sad because of her grandmother’s __________ (die).

小题7:The bicycle needs ___________ (little) space.

小题8:Beth, you don’t need ____________ (send) the letter by post. You can do it by e-mail.

填空题

根据对水分的适应，陆生植物可分为湿生植物、______植物和旱生植物。