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问题 单项选择题

关于速度和加速度的关系，下列说法中正确的是（）

A.速度越大，加速度越大

B.速度为零，加速度一定为零

C.速度变化越快，加速度越大

D.速度变化量越大，加速度越大

答案

参考答案：C

解析：加速度表示速度的变化快慢，与速度、速度变化量没有直接关系，ABD错；同理C对；故选C

阅读理解

阅读下列短文，然后信息归纳。

Hello, I’m Linda. I have a big family. They are my grandfather, grandmother, uncle, aunt, father, mother, cousin and me. My uncle likes sports. He has a great sports collection. He has three volleyballs and two soccer balls. My aunt likes music. She has many CDs and tapes. My cousin likes playing computer games and eating fruit. He eats a lot every day. I like reading. I have many books. I love my family.

小题1:There are有 __________people in the family.

小题2:Linda’s uncle has _________balls.

小题3:Linda’s aunt has _____________.

小题4:____________ likes playing computer games and eating fruit.

小题5:Linda likes __________________.
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多项选择题

物流信息系统开发的原则有（）

A、领导参加的原则

B、优化与创新的原则

C、充分利用信息资源的原则

D、实用和实效的原则
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