7. 现有四种元素，如果用指定化合价将它们按两种或三种元素结合成化合物，则最多可形成化合物的种数是(　　 )

A.4种　　　 B.5种　　　 C.6种　　　 D.7种

6. 下列叙述正确的是(　　 )

A.同种分子构成的物质一定是纯净物　　 B.同种元素组成的物质一定是单质

C.原子核内质子数一定等于中子数　 D.气体受压体积缩小是因为气体分子的大小发生了改变

5. 通过初中化学的学习，我们可以总结或发现许多具有一定规律的知识。下列所给的描述正确的是(　　 )

A.所有的酸中都一定含有氧元素　　 B.所有的盐中都一定含有金属元素

C.金属与盐溶液发生置换反应后，溶液的质量都增加　　 D.实验室制取气体前都要检查装置的气密性

4. 下列关于溶液的说法正确的是(　　 )

A.20℃时，在100g水中溶解了30g氯化钠，则20℃时氯化钠的溶解度是30g

B.气体物质的溶解度，随温度的升高而减小，随压强的增大而增大

C.在20℃时，向一定量的饱和石灰水中加入少量生石灰，若恢复到原温度时，溶液中溶质的质量不变

D.饱和硝酸钠溶液一定比不饱和硝酸钠溶液的溶质质量分数大

3. 关于木炭、一氧化碳、氢气分别与氧化铜的反应，下列说法错误的是(　　 )

A.都有红色物质生成　　 B.都有还原剂参加反应　　 C.都是置换反应　　 D.反应都需要加热或高温

2. “加碘食盐”、“加铁酱油”、“儿童补钙”，这里的碘、铁、钙是指(　　 )

A.单质　　 B.元素　　 C.原子　　 D.分子

1. 下列变化属于化学变化的是(　　 )

A.冰雪融化　　 B.分离液态空气制氧气　　 C.酒精燃烧　　 D.石蜡融化

71. choose　 72. while　　　　　 73. way　　　 74. be bought　 75. history

72．changed/corrected　 73．clothes　 74．trying　 75．alone　 76．better　 77．what/whatever

(2010•辽宁省沈阳市，五，9)　

　by　 together　 housework　 invited　 is　 however　 anyone　 that

　　　 As the World Cup is going on,South Africa's football grandmothers are also working hard. The team　 69　 made up of 35 women,aged from 50 to 84. It was developed　 70　 a housewife five years ago to help old women keep fit. The project has been so successful　 71　 they will take part in the Veterans Cup competition (元老杯足球联赛) in the USA.

　　　 "We are　 72　 to play in the Veterans Cup,where many grandmothers from all over the world come　 73　 and play football, "said the team leader.

　　　 Whatever happens,　 74　 , the grandmothers have no regrets. Most of them often play football in their aprons (围裙) after　 75　 .

　　　 "I suffered back pain and sore knees (腰酸腿痛) before joining the team three years ago. Now I am fresh. I don't feel　 76　 pain in my body，and I can run．At home I do all the housework by myself!”said　 77　 of the grandmothers．

[答案]69．is 70．by 71．that 72．invited73．together 74．however 75．housework 76．any77．one

　 (2010•甘肃省兰州市，五，10)　 用方框中所给单词的适当形式填空，每个单词限用一次，使短文通顺正确连贯，将答案填写在题后的横线上。

American summers are filled with outdoor picnics, baseball games and swimming pools. Summer in America is a time 66________ the outdoors, no matter how hot it might be. Let’s take a look at some of the popular drinks.

Lemonade is 67________ of all American summer drinks. It 68________ by mixing lemon juice, water and sugar. It is usually served very cold, with ice.

Ice tea is 69________ popular summer drink in America. Ice tea is usually 70________ in a tall glass of ice. Many Americans 71________ to add sugar to sweeten the drink. This drink is often drunk in the afternoon 72________ relaxing in the shade. Ice tea is now also sold by the bottle , at almost any store in America. 　

The Slurpee, a famous American drink in recent years, is a great 73________to cool off in the summer heat. It is a mix of ice, sugar and fruit juices. However, the drink is mostly made of ice. They can 74________ at most small convenient stores. Slurpees are popular with young Americans. Milkshakes have a long 75________ in America . It is made of a mix of ice cream , milk and flavoring.　

[答案]66. to enjoy　 67. the commonest　 68. is made　 69. another　　 70. served

73. d　　　　　　 74. d　　　　　　　 75. h

[答案]70. complain　 71. much　　 72. strict　　 73. development　　 74. duty　　　 75. help　

(2010•江苏省连云港市，四，5)根据对话意思和所给首字母，写出完整正确的单词

　Susan: Where are you going , David?　

　David: To Beijing?

　Susan: It’s a long trip from here by bike. How long will it take you to (51)c_________it?

　David: About two years.

Susan: How many (52)o______ you are making the trip?

　David: Five.

Susan: (53)W_________are you making it?

　David: We are trying to collec some money.

Susan: What will the money be used for?

　David: To a charity (54)c__________ Protecting the Red-Crowned Crane.

Susan: That sounds great. Good (55) l____________ with your trip.

　David: Thanks.

[答案]　 46．Spent　　 47.Once　　 48.less　　　 49.helpers　　　 50.symbol

　plete　　 52.of　　　　 53.Why　　 54.called　　　　 55.luck

(2010•江苏省镇江市，五，10)

根据短文内容及所给首字母提示写出所缺单词，并将完整单词写在答题卡对应题号的横线上。

Some western countries insist that China is one of the world’s biggest greenhouse gas emitters (温室气体排放者). But in fact our government has taken actions a46 to struggle with climate change.

Firstly, the public are educated to p47 more attention to the environment. As the government expects, the people have reached a very h48 level of knowing low-carbon economy(低碳经济). I 49　　 you watch TV, listen to the radio or read newspapers, you’ll find low-carbon lifestyle has become a fashion. Secondly, developing renewable energy is another action. The government is b 50　 　many wind farms and solar power stations in the deserts. Of course, w 51　 a long time, China will continue using the coal. At the same time, the government has been making l 52　 to punish those people who dare to destroy the environment. Besides, some s 53　 have suggested that greening the deserts is more important than developing new forms of energy. Their l 54　 research shows that 80% of the CO2 in the atmosphere comes from land?use.

As we know, China hasn’t a 55　 a balance between the green lifestyle and the economic growth, but we are on the way. We’ll take more actions to reduce the greenhouse gas emission.

46_________? 47_________? 48_________? 49_________? 50_________?

51_________? 52_________? 53_________? 54_________? 55_________?

[答案]46? actively47? pay48? high49? If50? building

51? within　 52? laws　 53? scientists54? latest　　 55? achieved

(2010•湖北省咸宁市，七，10)

Young people are often unhappy when they are with their parents. They say that their parents don’t (66)u　　　 them. They often think their parents are too strict (67)w　　　 them.

Parents often find it difficult to win their (68)c　　　 trust, and they seem to forget how they themselves felt when they were young.

For example, young people like to do things without much (69)t　　　 . It’s one of their ways to show that they grow up and they can solve any difficult (70)p　　　 . But older people always think (71)m　　　 than young people. Most of them plan things ahead and don’t like their plans to be (72)c　　　 , so when you want your parents to let you do something, you will succeed easily if you ask before you really start doing it.

Young people often make their parents angry by the (73)c　　　 they wear, the music they enjoy and something else. But they don’t mean to cause any trouble. They just want to be cut off(摆脱) from the old people’s world and they are (74)t　　　 to make a new culture of their own. And if their parents don’t like their music or clothes or their ways of speech, the young people feel very sad. Sometimes instead of going out with their parents, they just want to stay at home (75)a　　　 and do what they like.

If you plan to do something, you’d (76)b　　　 win your parents over and get them to understand you, if so, your parents will certainly let you do (77)w　　　 you want to do.

[答案]66．understand　 67．with　 68．children’s　 69．thinking/thought　 70．problems　 71．more