问题 选择题
下列各组中不是同类项的(  )
A.12a3b与
2ab3
3
B.3m3n2与2n2m3
C.2abx3与2bax3D.6a2m与-9a2m
答案

A中相同字母的指数不相同,不是同类项;

B、C、D选项中都含有相同的字母,且相同字母的指数也相同,故都是同类项.

故选A.

完形填空

任务型阅读理解:仔细阅读下面的短文并按要求完成后面的小题。(5小题,每小题2分,共10分)

Playing  is serious business for children . In fact , it’s what they do best ! Ask them why they do it , and kids will probably say , “ Because it’s fun !” But it’s much more than that . It’s also good for them .

3.Studies show that from birth babies learning through play . They use their five senses to get know their new world . Touching allows them to discover how different things feel . Brightly colored toys and clothing help develop a baby’s sense of sight .

When small children choose which toy to play with , they begin developing their abilities in making decisions .Children love toys that allow them to use their imagination .Sometimes an empty box is more fun than a high—tech toy . That’s because a box can become anything a child imagines it to be .

Crayons , paints and Play-Doh (彩色塑泥) are also good because they allow children to create . Traditional building blocks teach important pre-math skills like problem—solving .

4.Playing doesn’t become any less important once children start school . Many valuable lessons about life are learned on the school playground . Kids learn how to share , take turns and play by the rules .

What can children do best in their childhood ?______________

What kind of toys do children lover ?

_______________________________________________.

将短文译成汉语

3_____________________________________

4_____________________________________________

5.请给短文拟一个适当的题目。___________________________

单项选择题