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问题 问答题

如图所示，重200N的小球在一斜面上静止．图中是小丽同学画的小球所受重力的示意图．她画得对吗？为什么？

答案

答：不对；重力的方向竖直向下，所以小丽同学画的小球所受重力的示意图是错误的．

选择题

Nowadays,almost all the Chinese people are__________ to basic health care services. This accounts for the fact that the average life expectancy of the Chinese has already risen to 75.

A．alternative

B．abundant

C．accessible

D．creative
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选择题

—Are you feeling better now?

—Yes, a little sleep is really             . [ ]

A. enjoyable

B. grateful

C. comfortable

D. helpful

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