下列计算正确的是( )A.a6÷a2=a3B.2a×3a=6aC.(a2)3=

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问题:

下列计算正确的是(   )
A.a6÷a2=a3
B.2a×3a=6a
C.(a2)3=a6
D.(a+b)2=a2+b2
考点:整式的加减乘除混合运算
题型:选择题

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Your friends might be in Australia or maybe just down the road , but they are all just a few clicks away. Life has changed for millions of teenagers across the world who now make friends online. Whether you use chat rooms, QQ, MSN or ICQ, you are part of a virtual community.

“I rarely talk with my parents or grandparents,but I talk a lot with my old friends on QQ,” said Fox’s Shadow, the online nickname used by a Senior 2 girl in China. “Eighty per cent of my classmates use QQ after school.”

QQ is the biggest messaging service in China. A record 4 million people used it one Saturday night in October, according to Tencent, the company which developed QQ.

And Fox’s Shadow might well have been one of them. “I log in on Friday nights, and Saturdays or Sundays when I feel bored. I usually spend  about 10 hours chatting online every week,”she said. “But I rarely talk with strangers, especially boys or men.”

Even though she likes chatting, she is careful about making friends with strangers online. “You don’t know who you’re talking to. You should  always be careful about who you trust online.”

64. According to Tencent, one Saturday night in October about four million people ________.

A. enjoyed themselves on QQ       B. developed QQ

C. talked about QQ                D. made friends on QQ

65. Which of the following is NOT true according to the passage?

A. Perhaps the person you are chatting with lives just next door to you.

B. maybe the person you are talking with online is an overseas one.

C. No people online know the opposite’s real name or real address.

D. Four fifths of Fox’s Shadow’s classmates use QQ in their spare time.

66. Fox’s Shadow, according to the passage, is a online nickname of ____.

A. a boy    B. a girl   C. a QQ worker  D. a mid-aged person

67. When you are chatting online, _____.

A. never believe everyone who is talking to you

B. never trust anyone who is talking to you

C. don’t make friends with the one who is talking to you

D. don’t talk too long with the one who is talking to you

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为保护环境而提倡的低碳生活,是指生活中所耗用的能量要尽量减少,从而减低二氧化碳的排放量,下列各项属于低碳生活方式的是 

①骑自行车或者步行上学②农田秸秆焚烧处理③少开空调、少吹风扇④电脑始终处于开机状态⑤少看电视,多户外运动 [ ]

A.①③⑤

B.②④⑤

C.①②③⑤

D.①②③

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谵妄发生的主要原因是

A.脑血管意外,脑部充血
B.迷走神经兴奋性降低
C.大脑细胞发生器质性改变
D.中枢神经系统调节功能紊乱
E.中枢神经系统发生的急性功能失调

题型:选择题

重型胎盘早剥与先兆子宫破裂共有的临床表现是( )。

A.合并妊娠高血压综合征

B.剧烈腹痛

C.跨耻征阳性

D.子宫呈板状硬

E.出现病理缩复环

题型:选择题

城建档案征集工作应有()以上工作人员共同进行。

A、一名

B、二名

C、三名

D、四名

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