如果从银行存入500元记作+500元，那么从银行取出700元记作______元．

Most people in America live in small family groups. More than a quarter of homes in America have only got one person in them. Some of these are old people but some are people of twenty or thirty years old who would like to live alone. 35％ of homes have two people in them, and another 17％ have three people. 15％have four people in them, and the other homes have five or more.

The families in America are small. It is unusual for parents to have more than two children. When children are about eighteen or nineteen years old, they leave their parents’ homes, and they often go to different cities. Sometimes they only visit their parents two or three times a year.

小题1:How many people in America have 3 people living in them?

A．17%

B．15%

C．35%

D．5%小题2:At what age do children in America usually go away from. heir parents’ homes？

A．About 30 or 31

B．About 20 or 21

C．About I ? or less

D．About 18 or 19小题3: What is the passage?

A．A traveling story

B．A report

C．An invention

D．A joke

某市晚报为了评估市民对该报的欢迎程度，抽样调查了210个人对阅读该报后自己的评论意见，各类人员、各种评价意见的统计结果如表1-6所示。

表1-6 晚报调杏统计表

	经常阅读	偶尔阅读	不了解	合计
很好	56	4	0	60
好	86	23	1	110
一般	8	11	0	19
差	5	16	0	21
合计	155	54	1	210

该统计表中______。

A．各项数据是正常的
B．含有计算错误
C．数据没有参考价值
D．含有违反常理的数据

有关胎盘功能错误的一项是()

A．胎儿的代谢产物由母体排出体外

B．具有较好的防御功能，细菌、病毒均不能通过

C．免疫球蛋白G可通过胎盘

D．分泌大量雌、孕激素

E．合体滋养细胞产生大量胎盘生乳素

注释说明了程序的功能，它分为 【2】 注释和功能性注释。

1/2，3/2 ，11/8 ，21/32 ，（ ）

A．7/64

B． 25/64

C．13/2

D．13/64