【题目】下列常见的盐在生产、生活中的用途不合理的是( )。

A．用亚硝酸钠腌制食品

B．碳酸钠广泛应用于玻璃、造纸、纺织和洗涤剂的生产

C．用纯碱消耗面粉发酵生成的酸

D．天安门前的华表是用大理石做的，碳酸钙还可用作补钙剂

【题目】下表记录了物质X的溶液分别加入到另外三种物质的溶液中产生的现象。则物质X的化学式可能是( )。

A.Ca(OH)2 B．CuSO4 C．HCl D．KCl

【题目】下列常见的物质中，不代表同一种物质的是( )。

A．氯化钠、盐 B．氢氧化钠、苛性钠

C．碳酸钠、纯碱 D．碳酸氢钠、小苏打

【题目】在贝壳上滴稀盐酸，能产生使澄清石灰水浑浊的气体， 这说明贝壳中含有的离子是( )。

A．Ca2＋ B．CO32- C．SO42- D．OH－

【题目】下表是某实验报告中的一组数据：

（1）从实验①、③数据可知：Na2CO3溶于水________热量，NaHCO3溶于水________热量(填“放出”或“吸收”)。

（2）根据t2>t1 可知Na2CO3与稀盐酸反应______热量，根据t4<t3 可知：NaHCO3与稀盐酸反应______热量(填“放出”或“吸收”)。

【题目】现有60 ℃时硝酸钾的饱和溶液，若将其温度降到20 ℃，此时有关该溶液的说法不正确的是( )。

A．仍为饱和溶液

B．硝酸钾的溶解度发生了变化

C．降温前后溶液的质量不变

D．降温前后溶剂的质量不变

【题目】下列加速溶解的措施中，能改变固体溶解度的是( )。

A．把固体研细 B．加热

C．搅拌 D．振荡

【题目】生活中常见的下列物质，不属于溶液的是( )。

A．糖水 B．蒸馏水

C．碘酒 D．汽水

【题目】A

Many people like animals such as dogs and cats and keep one or more of them as pets. If you keep a dog or a cat as a pet, you must know how to look after it.

A grown-up dog needs two meals a day — not more. It can eat meat, fish, rice and some other things. Dogs like large bones(骨头), but you can’t give them chicken bones. Remember to give them much clean water.

A dog should have a clean, dry box for sleeping. Washing it once a week is good for its health. If it is ill, take it to a doctor. A healthy dog will bring you more pleasure.

Be careful when you choose a cat. A cat has two meals a day with some meat or fish. It drinks a little milk every day. Sometimes you can give it vegetables to eat. Don’t forget that it needs clean water to drink.

Take good care of your pets, they will be your good friends. Maybe they can give you some help when you are in need.

【1】 Many people keep __________ as pets.

A. pandas B. elephants C. chicken D. cats

【2】 What do dogs like eating?

A. All the bones. B. Big bones.

C. Chicken bones. D. Small bones.

【3】 A healthy dog can make you __________.

A. happy B. trouble C. cry D. ill

【4】 Cats usually drink __________.

A. orange B. red ink C. apple juice D. milk and water

【5】Will pets be people’s friends according to /span>the article?

A. No, I don’t think so. B. Yes, but only a little.

C. Yes, they will. D. No, they won’t.