【題目】下列常見的鹽在生產(chǎn)、生活中的用途不合理的是( )。

A．用亞硝酸鈉腌制食品

B．碳酸鈉廣泛應(yīng)用于玻璃、造紙、紡織和洗滌劑的生產(chǎn)

C．用純堿消耗面粉發(fā)酵生成的酸

D．天安門前的華表是用大理石做的，碳酸鈣還可用作補(bǔ)鈣劑

【題目】下表記錄了物質(zhì)X的溶液分別加入到另外三種物質(zhì)的溶液中產(chǎn)生的現(xiàn)象。則物質(zhì)X的化學(xué)式可能是( )。

A.Ca(OH)2 B．CuSO4 C．HCl D．KCl

【題目】下列常見的物質(zhì)中，不代表同一種物質(zhì)的是( )。

A．氯化鈉、鹽 B．氫氧化鈉、苛性鈉

C．碳酸鈉、純堿 D．碳酸氫鈉、小蘇打

【題目】在貝殼上滴稀鹽酸，能產(chǎn)生使澄清石灰水渾濁的氣體， 這說明貝殼中含有的離子是( )。

A．Ca2＋ B．CO32- C．SO42- D．OH－

【題目】下表是某實(shí)驗(yàn)報(bào)告中的一組數(shù)據(jù)：

（1）從實(shí)驗(yàn)①、③數(shù)據(jù)可知：Na2CO3溶于水________熱量，NaHCO3溶于水________熱量(填“放出”或“吸收”)。

（2）根據(jù)t2>t1 可知Na2CO3與稀鹽酸反應(yīng)______熱量，根據(jù)t4<t3 可知：NaHCO3與稀鹽酸反應(yīng)______熱量(填“放出”或“吸收”)。

【題目】現(xiàn)有60 ℃時(shí)硝酸鉀的飽和溶液，若將其溫度降到20 ℃，此時(shí)有關(guān)該溶液的說法不正確的是( )。

A．仍為飽和溶液

B．硝酸鉀的溶解度發(fā)生了變化

C．降溫前后溶液的質(zhì)量不變

D．降溫前后溶劑的質(zhì)量不變

【題目】下列加速溶解的措施中，能改變固體溶解度的是( )。

A．把固體研細(xì) B．加熱

C．?dāng)嚢?/span> D．振蕩

【題目】生活中常見的下列物質(zhì)，不屬于溶液的是( )。

A．糖水 B．蒸餾水

C．碘酒 D．汽水

【題目】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(骨頭), 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.