下列说法中正确的是（） A．破镜不能重圆，是因为分子间存在斥力 B．一桶水的比

发布时间：2017-07-26 16:40 │ 来源：www.tikuol.com

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问题：

下列说法中正确的是（　　）

A．破镜不能重圆，是因为分子间存在斥力

B．一桶水的比热容和一杯水的比热容相同

C．用锯条锯木板时锯条发热，锯条的内能增加，木板的内能减少

D．水从高处往低处流，是因为分子在不停地运动

考点：物体内能的改变方法（做功、热传递）水的比热容的特点及其应用

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根据表格内容完成下列短文。

It's useful to know how much money we usually spend on different things. Then, if we also know how
much money we will have, we can decide which things we should buy now and which things we can go
without or wait for.
Here is a student's weekly budget (预算) during the school year.

Bus fares (车费) to class	$5	Movies	$6
Candy/Gum (口香糖)	$5	Soft drinks	$3
School lunches	$10	CDs	$10
Restaurants	$15	Computer games	$10

This student has only $50 a week to spend (花费). Therefore, he must spend less on some things or not
have them at all. If he wants to save (节省) on bus fares, he can 1______ to class. If he doesn't buy any candy,
he can save 2______ a week. Or he can save 3______ if he has no soft drinks. He can save on lunches if he
brings his own. He may be able to save on VDs by borrowing them from his friends or 4______ second-hand
(二手). He doesn't have to 5______ to the movies or restaurants.

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门齿适于____________，臼齿适于_____________，犬齿用于_ _________。

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先化简，再求值：3a²b-[2a²b-（2ab-a²b）-4a²]-ab，其中a=-3，b=-2

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在社会发展中起决定作用的是( )

A．生产方式
B．地理环境
C．人口因素
D．文化传统

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大体上，写作销售活动分析报告的首要步骤应该是（）。

A、收集资料、掌握数据

B、制订分析计划，明确分析的目的、要求

C、拟订写作提纲

D、组织市场调研

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