下列计算错误的是( ) A.(-2)0=1 B.2a2-a2=a2 C.6.5×

题型:选择题

问题:

下列计算错误的是(  )

A.(-2)0=1

B.2a2-a2=a2

C.6.5×10-2=0.0065

D.a2b÷ab=a

考点:科学记数法和有效数字同类项零指数幂(负指数幂和指数为1)整式的除法
题型:选择题

阅读理解。

     One afternoon, Kate and her brother, Bob, went out to play. Kate was eight, and Bob was ten. "Let's

go to the bridge and we can see fish in the river." said Kate.

     "I don't know…" Bob said. "Mum told us, 'Don't go on the bridge.' She said it's dangerous."

     Kate said, "I am not afraid. Are you?"

     They walked onto the bridge and began looking for fish in the river. The bridge was a train bridge.

Trains went over the bridge three times a day.

     The  children  were  standing in  the  middle  of the bridge when they heard a loud noise. "A train is

coming!" Bob shouted. "Run!" He ran to the end of the bridge. He was safe.

     Kate ran, too, but she fell. The train was coming fast. Kate ran towards Bob. She fell again right on

the  train  tracks (铁轨). There was no time to leave. She had to lie down  between  the  tracks. A few

seconds later, the train went over the girl, but  she  was not  hurt  at all. She  stood up  and said to  Bob,

"Don't tell Mum! Don't tell Mum!"

     At last their mother found out about the story. She was angry because they went on the bridge. But

she was happy that Kate was all right.

1. Bob and Kate were _____.

A. twins

B. brothers

C. sisters

D. brother and sister

2. One afternoon they went to the bridge to see _____.

A. their mother

B. fish

C. the train

D. the river

3. When the train came, the children were _____.

A. in the middle of the bridge

B. at the end of the bridge

C. on their way to the bridge

D. away from the bridge

4. Where was Kate when the train was going over her?

A. She fell again right on the train tracks (铁轨).

B. Kate ran towards Bob.

C. She had to lie down between the tracks.   

D. She stood up and cried.

5. When their mother knew about the story, she was _____.

A. happy

B. angry

C. sorry

D. both angry and happy

题型:选择题

在某次学术会议上,有人发现:凡是认识李博士的人,张教授都认识;只要是有些人不认识的人,赵研究员全都认识:新参加会议的研究生小王不认识与会的任何人。根据以上陈述,可以得出()。

A.张教授与赵研究员相互认识

B.张教授认识赵研究员,但赵研究员不认识张教授

C.张教授与赵研究员相互不认识

D.张教授不认识赵研究员,但赵研究员认识张教授

题型:选择题

房地产开发企业销售商品房时,不需缴纳()

A、营业税

B、城市维护建设税

C、教育费附加

D、房产税

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股票发行______结束了股票发行的额度限制。

A.监管制度
B.保荐制度
C.准则制度
D.核准制度

题型:选择题

内乳淋巴结用单独一野垂直照射时根据内乳淋巴结的深度来选用适当的射线,如60钴、单独电子束或高能X线混合线束等,剂量参考点定在皮下()

A.1cm

B.2cm

C.2.5cm

D.3cm

E.4cm

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