问题 填空题

比较下列性质(用“>”、“<”填空)

①非金属性 Br______I         ②金属性 Be______Mg   ③碱性 Mg(OH)2______Al(OH)3

④稳定性 H2S______ H2O      ⑤酸性 H3PO4______ H2SO4

答案

①同一主族元素从上到下非金属性逐渐减弱,所以非金属性:Br>I,故答案为:>;

②同一主族元素从上到下金属逐渐增强,所以金属性:Mg>Be,故答案为:<;

③同一周期元素从左到右最高价氧化物对应水化物的碱性逐渐减弱,所以碱性 Mg(OH)2>Al(OH)3,故答案为:>;

④同一主族元素从上到下氢化物稳定性逐渐减弱,所以稳定性 H2S<H2O,故答案为:<;      

⑤同一周期元素从左到右最高价氧化物对应水化物的酸性逐渐增强,所以酸性:H3PO4<H2SO4,故答案为:<.

阅读理解

阅读理解。

     You have heard of Webster Toys. Webster's have made good, safe, interesting toys for more than a

hundred years. Now we sell them, and children play with them, in countries from New Zealand to Norway,

and from Japan to Brazil. We're looking for someone to sell our toys in the Far East. He (or She) will be

between the age of thirty and forty. He (or She) will already have some years of selling in world market

behind him (or her). He (or She) will speak good English, and at least one other language of the Far East. 

     The person we are looking for will live in Singapore, and work in our office there, but he (or She) will

trayel for up to six months in any one year. He (or She) will know the Far East quite well already. He (or

She) will understand money, and make more than ever before, for himself (or herself), and for Webster

Toys.

     Webster's want someone who can stand on his or her own feet. If you think you're the person we're

looking for, write to Mr. J. Sloman at our Head Office.

     Webster Toys Ltd.

     Church Mill, Watford.

     Herts, WD36HF.

1. Children play with Webster toys ____. [ ]

A. only in countries a long way from each other

B. in only four countries of the world

C. only in New Zealand, Norway, Japan and Brazil

D. all over the world

2. "He (or She) will already have 'some years' of selling in world market behind him (or she)" means ____. [ ]

A. he (or she) has already sold things in different parts of the world

B. he (or she) has sold toys for some years

C. he (or she) has some experience of selling in the world market for some years.

D. he (or she) has sold toys all over the world

3. The person will speak ____. [ ]

A. English and only one other language

B. English and a Far Eastern language

C. English or any other language

D. English or any other Far Eastern language

4. He (or She) will live in Singapore ____. [ ]

A. for at least 6 months in any one year

B. all through the year

C. for less than six months a year

D. for up to 6 months

5. "someone who can stand on his (or her) own feet" means some-one who ____. [ ]

A. doesn't stand on other people's feet

B. can understand money

C. understand many languages

D. can work by himself or herself

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