(2013年四川眉山3分)下列计算正确的是【】 A.a4+a2=a6 B.2a•

题型:选择题

问题:

(2013年四川眉山3分)下列计算正确的是【   】

A.a4+a2=a6

B.2a•4a=8a

C.a5÷a2=a3

D.(a23=a5

考点:整式的定义整式的加减单项式多项式同类项
题型:选择题

阅读理解。

     Joe was the best potato farmer in the state of Idaho, maybe the best in the whole world. He took pride in

his work and did the best he could to grow the best and healthiest potatoes.

     At harvest time, Joe would spend his time making sure that his potatoes were ploughed out of the ground

in a proper way so that they wouldn't get damaged (损害). Joe was looking forward to a great potato crop.

     Joe and his workers had a great potato crop but they couldn't finish the harvest yet. There was a big piece

of land that was so hard that the plough (犁) was not able to dig it up. So Joe decided to leave it till the next

day.

     The next day Joe went to dig his shovel (铁锨) into the land. He discovered that it was one big potato. He

thought this must be the biggest potato in the world. But how could he get it out? This potato was bigger than

a truck!

     Joe knew it wasn't going to be easy, but he had an idea. He decided to call a big Crane (起重机) company

and asked them for their help. He called the Guinness World Records (吉尼斯世界纪录), to introduce the

biggest potato in the world. After twenty minutes some reporters took pictures of the big potato and Joe. 

    They dug it out and it made the book, and Joe became the richest farmer alive. Every day he would go

outside and kiss the big potato until it slowly went bad.

1. Joe was the best potato farmer because ______ in the world. [ ]

A. he grew the most potatoes

B. he grew the best potatoes

C. he had the biggest potato

D. he was proud of his farm work

2. ______ for Joe and his workers to dig up. [ ]

A. The land was too large

B. The potatoes were too deep

C. The land was not soft enough

D. The potatoes were not big enough

3. A ______ was used to get the big potato out. [ ]

A. machine

B. truck

C. shovel

D. plough

4. From the passage we know ______. [ ]

A. the big potato was sold to the Guinness

B. Joe's workers also got a lot of money

C. Joe's field was near to

D. Joe became the richest farmer

5. The best title for the passage is ______. [ ]

A. How to Dig Up Potatoes

B. How to Grow Good Potatoes

C. The Largest Potato in the World

D. Joe and his Workers

题型:选择题

When we came to the gate, he stopped _______ me go in first. [ ]

A. to let

B. to tell

C. to allow

D. to ask

题型:选择题

我国采取直接选举和间接选举相结合的方式,下列属于公民直接参与选举的有

①县及县以下人大代表的选举                ②县以上各级人大代表的选举

③乡及乡以上政府领导人员的选举            ④农村村民委员会成员的选举

A.①②

B.③④

C.①④

D.②③

题型:选择题

某变电所新装GGF-300型蓄电池共118个,验收时以30A的电流放电,测得电压为236V,停止放电后蓄电池组电压立即回升到253.7V,求蓄电池总内阻r和每个电池的内阻r′。

题型:选择题

在任何情况下,发包人按照履约担保提出索赔之前,应由()说明导致索赔的违约性质。

A.监理单位

B.总监理工程师

C.项目经理

D.承包人

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