下表为1976～1990年苏联经济增长率（%）简表。其中，1990年经济发展出现

探究性学习。    

　　在一次《我爱班集体》的班会活动课上，有不少同学迟到。班主任老师说：“迟到了的同学站起来！”有六七位同学站了起来。班主任老师又说： “迟到过的同学也站起来！”这时，又有十来个同学站了起来。班主任说：“好了，请坐下。我再请迟到着的同学站起来！”结果，教室里没有一个同学站起来，反而响起一阵笑声。同样的一句话，好像只改动了一个无关紧要的字，却得到了不同的结果。

请你探究一下为什么会有这样的结果。

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下列有关tRNA的叙述中，错澡的是

A．一种tRNA只能转运一种氨基酸

B．为RNA中分子最小的

C．分子中含有遗传密码子

D．分子中含稀有碱基较多

E．一种氨基酸可被数种tRNA转运

Watching television makes it easier for toddlers（学走路的孩子）to kick and scream, according to a U.S. study. Children under two should not watch any TV. The longer they sit in front of the box, the worse their behavior becomes.

Just having the TV on in the background, even if the child wasn’t watching it, was also connected to troublemaking behavior although the relationship wasn’t as strong, said the researchers.

“Parents should be smart about TV use,” researcher Jennifer Manganello from the University at Albany, New York, said.

“They should limit the time that children use TV, pay attention to the content of TV programs, and consider how TV is used throughout the home.”

The study looked at 3,128 women from 20 U.S. cities who had a child between 2005 and 2008.

While there was some diversity（差异）of education among the women, one-third hadn’t graduated from high school.

Two-thirds of the mothers said their three-year-old watched more than two hours of TV a day, and the average（平均的）viewing time for children was around three hours. On average, the TV was on for about five additional hours on a common day.

After accounting for factors（因素）such as living in a violent neighborhood, scientists also found watching TV was strongly connected to behavior such as hitting others, having angry moods, being disobedient（不服从的）, and screaming a lot.

The researchers thought that children may see violence on TV, and spend less time on positive development tasks such as reading or playing.

The American Academy of Paediatrics suggests no TV at all for children at two and younger, and two hours a day or less for older kids.

小题1:what is the main idea of the passage?

A．Children should choose positive programs.

B．Children should keep away from TV.

C．Watching TV can make children violent.

D．Parents should watch less TV.小题2:what do we know from Paragraph 2?

A．Children can watch good programs.

B．Children will be affected as long as the TV is on.

C．It’s OK that the TV is on if children don’t watch it.

D．Children’s troublemaking behavior is mainly caused by watching TV.小题3:what can be learned about the study between 2005~2008 from the passage?

A．The TV was on for about three hours.

B．The women studied have different jobs.

C．The study included men and women.

D．Most women allowed their child to watch TV.小题4:Children who spend much time watching TV will ________.

A．not be hit by others

B．be influenced by others

C．become angry easily

D．know more about the neighborhood

求取房地的重新购建价格，可以采用类似于评估新建房地价格的成本法来求取。（）

亚硝酸盐、硫代硫酸钠疗法或大剂量亚甲蓝，用于哪项抢救（）

A.氰化物中毒

B.亚硝酸盐中毒

C.有机磷中毒

D.酒精中毒

E.重金属中毒