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问题 选择题

下列现象中不可能出现的是（　　）

A．一头母猪产下一窝小猪，小猪相貌各不相同

B．双眼皮的一对夫妇生出了一个单眼皮的儿子

C．完全相同的孪生兄弟或孪生姐妹

D．同一豆荚中的豆子播种后，长出的植株却不尽相同

答案

答案：C

阅读理解
Today, more and more students surf the Internet. Whether(是否) students should surf the Internet is a hot topic. Different people have different opinions .Last week, we did a survey about students surfing the Internet. We think maybe it can help you learn a little. The survey below is from the students of No.14 Middle School. One hundred students joined in the survey.
How often they surf the Internet
Once a day
Once a week
Hardly ever
12%
68%
6%
How long every time
Half an hour
An hour
More than an hour
26%
57%
17%
What they like doing
Playing games
Studying
Chatting with friends
64%
22%
14%
Whether they have a best friend online (在线)
Yes
No
 
58%
42%
 
What they think of the Internet
Relaxing
Interesting and helpful(有帮助的)
Dangerous
60%
22%
3%
 
小题1:Most students spend        on the Internet each time.
A．half an hourB．an hourC．more than an hourD．more than two hours
小题2:Only a few students think the Internet is        .
A．relaxingB．interestingC．helpfulD．dangerous
小题3:According to the passage and the survey, we know        .
A．students shouldn’t play games on the Internet
B．parents should let their children go online
C．most students often study on the Internet
D．most students go online just for relaxing themselves
查看答案
单项选择题

钢筋的锈蚀可以用（）检测。

A.电磁感应法

B.回弹法

C.超声脉冲法

D.电位差法
查看答案