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问题 单项选择题

一学生在百米赛跑中，测得他在50m处的瞬时速度为6m/s，16s末到达终点的瞬时速度为7.5m/s，则它在全程内的平均速度是（）

A.6m/s

B.6.25m/s

C.6.75m/s

D.7.0m/s

答案

参考答案：B

解析：

该同学全程的位移为100m，全程所用时间为16s，所以平均速度为，B正确

填空题

请根据句意，用括号中所给词的适当形式填空。

1. Tom __________________ (not do) his homework last night.

2. Miss Gao is one of ______________ (good) teachers in our school.

3. She hurried to the room _______________ (ask) where the student was.

4. Yao Ming was _____________ (call) "Big Yao". He likes the name.

5. Many people are looking forward to ______________ (come) to China.

6. We _____________(reach) Nanjing next Friday.

7. The pilot landed on the ground ____________ (safe).

8. March 8 is ______________(woman) Day.

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单项选择题

肾糖阈的正常数值为

A．100mg%～120mg%
B．100mg%～140mg%
C．160mg%～180mg%
D．180mg%～200mg%
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