胜利油田标准RTU DI3接（）信号。 A.启动信号 B.停止信号 C.下死点信号

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A、全国社保基金

B、存款准备金

C、全国住房公积金

D、全国医疗保险金

Changsha,

Hunan Province

May 6, 2010

Dear editor,

Under China’s current (现在的) educational system, there are those who do nothing but study. They of course are thought to be model students.

But I feel that there is another type of student who, perhaps not as diligent (勤奋的) as the first type, uses his time more efficiently and achieves a lot academically.

Last year, a classmate of mine was accepted by a top university. It surprised all of us. It was because, unlike most of us, he didn’t spend too much of his time studying.

When I asked him the secret of his success, he said that the key was properly and scientifically arranging his time.

“ I spent a lot of time keeping fit and as a result, I was able to better concentrate (集中) on my class work.”

The moral (教训) of the story is: it isn’t necessary to sit at your desk all day long to get high academic (学术) grades.

Yours,

Zhang Zishu

小题1:What does the letter-writer (a reader) think leads to the fact that many students do nothing but study?

A．The present educational system.

B．People’s old ideas.

C．The teaching methods.

D．The parents of these students.小题2:It seems that this reader thinks        .

A．the first type of student is our model

B．the second type of students is our model

C．both types of students are worth learning from

D．neither of the two types of students are good小题3:The reader wrote the letter in order to        .

A．call on us to work even harder

B．cause people to think about how to study more efficiently (有效地)

C．advise people to do research into his classmate’s success

D．criticize (批评) China’s educational system小题4:What would be the best to stand for (代表) the letter-writer’s opinion?

A．Secret of success.

B．China’s educational system needs changing.

C．Work while you work and play while you play.

D．Keep fit first.

下图是周期表中短周期的一部分，若a原子最外层的电子数比次外层少了3个，则下列说法正确的是

A．a、b、c的最高价氧化物对应水化物的酸性强弱的关系是c >b>a

B．d的最高正价与b的最高正价相等

C．b与d不能形成化合物

D．原子半径的大小顺序是c>b>a>d

细菌性痢疾诊断标准

A口采用E1接入时，接口板选择（）。