元杂剧的分类？

阅读理解。

     In the United States, parents usually encourage their children to develop their potential (潜能). They pay

attention to what their kids can do, not what they can't. As a result, US boys and girls hope to be actors,

athletes and doctors; many even want to become presidents when they grow up.

    US parents often encourage their children to take part in all kinds of activities at school. They believe that

joining in these activities can make their children mature (成熟). Schoolwork is important, but they think that

social skills are important as well.

     But things in China are different. Chinese parents often tell their children to study hard and pass exams.

They think that, for a student, staying away from schoolbooks means wasting time. This puts a lot of pressure

on Chinese students, so leaders in China's education department have called for less homework at the lower

grades. Only healthy kids can become healthy adults.

1. American parents think that _______. 

A. Schoolwork is as important as social skills 

B. Schoolwork is more important than social skills 

C. Schoolwork is less important than social skills 

D. Passing exams is the most important for their children

2. Why do many American children have their dream jobs? 

A. Because they start school earlier than Chinese children. 

B. Because they study hard. 

C. Because their parents encourage them to do less homework. 

D. Because their parents usually pay attention to what they can do,not what they can't.

3. Chinese parents think that _______. 

A. taking part in all kinds of activities at school can make their children mature 

B. staying away from schoolbooks means wasting time 

C. their children should do what they want to do 

D. social skills is necessary for the students at lower grades

4. According to this passage the writer thinks _______. 

A. China's education is better than America's 

B. America's education is better than China's 

C. Chinese students at the lower grades should have more homework 

D. Chinese students have less pressure than America's

质量为m的质点沿半径为r的圆周运动，速度大小恒为v，则（　　）

A．质点运动的角速度为vr

B．质点沿圆周运动一圈所用的时间为

C．质点所受的合力大小为mr²v

D．质点所受的合力一定沿半径指向圆心

软件生产过程将产生各种产品，如文档、手册和程序，且软件本身也会更新，故应对软件进行管理，既称软件配置管理也称为( )。

A．软件管理

B．版本管理

C．文档管

D．计划管理

支气管炎患者咳痰为

A．白色泡沫样痰

B．黄脓痰

C．铁锈色痰

D．粉红色泡沫样痰

E．痰有恶臭味

生姜与黄芩的配伍关系是

A．相须
B．相使
C．相畏
D．相反
E．相恶