如图为甲乙两质点做直线运动的x-t图象，由图象可知（ ） A．甲乙两质点在2s末

右图是关节模式图，能增加关节牢固性的结构是

A．①

B．②

C．③

D．④

20世纪初，随着奥地利心理学家（）的无意识理论的出现，对人类意识的理解到达了一个新的阶段，在文学创作本质的认识上也出现了以（）为代表的“无意识的升华”说和他的弟子（）的“集体无意识理论”，它们共同标志着对文学创作本质的理解达到了一个新的阶段。

( )是反映一定时期经济发展水平变化程度的动态指标，也是反映一个国家经济是否具有活力的基本指标。

A．国内生产总值

B．固定资产投资增长率

C．国际收支增幅

D．经济增长率

People are so busy these days that many have no time to cook. This is a problem, because many families love home cooking! A family meal brings everyone together. In some families, meals are often the only time everyone sees one another at the same time.

Another reason people enjoy home cooking is that it is often a way of showing love. A parent who makes some cookies is not just satisfying a child's sweet tooth. She or he is sending a message. The message says,“I care about you enough to spend an hour making cookies that you will eat up in no time.”

There is also something about the smell of home cooking. The smell of home cooking pleases people of all ages. It makes most of us feel good and loved—even if we are the ones doing the cooking! Next time you smell a cake being cooked, stop for a moment and pay attention to your mood.

1. Fewer people cook now because _________.

A. they have no time.               B. they are not busy.

C. many people don't like cooking.    D. they don't like family meals.

2. A parent spends an hour making cookies __________.

A. just to satisfy her or his child's sweet tooth    B. only to send a message.

C. so her child can eat them in 15 minutes      D. to show her or his love

3. The writer thinks the smell of home cooking makes us _________.

A. feel happy                 B. interested in cooking

C. pay attention to our mood     D. love others

4. What's the main idea of this passage?

A. Family meals are important.     B. How to make cookies.

C. People are too busy to cook.     D. Home made cookies taste better。

供电电压的质量表现方面。正确的是（）

A.电压的闪变

B.偏离额定值的幅度

C.电磁波的幅射

D.供电的可靠性

E.电压正弦波畸变程度

F.电压的对称性