试题与答案

写出下列元素的符号或名称: (1)碳______,铜______,钙______

题型:填空题

题目:

写出下列元素的符号或名称:

(1)碳______,铜______,钙______,钠______,Ag______,Mn______,Fe______,K______.

(2)3个钠离子______,4个氯离子______,2个镁离子______.

(3)按要求回答下列问题:

5个氧原子:______,Hg:______,氮元素:______,nS:______.

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B解析:因素分析法是用来分析影响指标变化的各个因素以及它们对指标各自的影响程度。其基本做法是,假定影响指标变化的诸因素之中,在分析某一因素变动对总指标变动的影响时,假定只有这一个因素在变动...

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题型:阅读理解

American schools begin in September after a long summer holiday.There are two terms in a school year,the first term is from September to January,and the second is from February to June.Most American children begin to go to school when they are five years old.Most students are seventeen or eighteen years old when they finish high school.

High school students take only four or five subjects(科目)each term.They usually go to the same class every day,and they have homework for every class.After class they do many interesting things.After high school,many students go to college.They can go to a small one or a large one.They usually have to give a lot of money.So many college students work after class to get the money for their studies.

小题1:Most American children go to school when they are _________ years old

A.four.

B.five .

C.six.

D.seven .小题2:High school students ______ after class .

A.do a lot of homework.

B.do many interesting things.

C.often sing songs.

D.do lots of reading.小题3:After high school , many students  _________ .

A.begin to work.

B.stay at home.

C.go to college.

D.visit their friends.小题4:Many college students work after class because _________

A.they want to get some money for their studies .

B.they don' t have anything to do .

C.their parents ask them for money.

D.their teachers ask them to do so .小题5:From the passage we know that in America a summer holiday begins in _________  .

A.January

B.September.

C.February

D.July

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