问题 选择题

某合作学习小组讨论辨析以下说法正确的是(  )

①粗盐和酸雨都是混合物

②沼气和水煤气都是可再生能源

③冰和干冰既是纯净物又是化合物

④不锈钢和目前流通的硬币都是合金

⑤盐酸和食醋既是化合物又是酸

⑥纯碱和熟石灰都是碱

⑦豆浆、雾、烟都是胶体

⑧利用丁达尔效应可以区分溶液和胶体.

A.①②③④⑥

B.①③④⑦⑧

C.③④⑤⑥⑦

D.①②④⑤⑧

答案

①粗盐含有杂质和酸雨中溶有二氧化硫都是混合物,故①正确;

②沼气和水煤气都是不可再生能源,故②错误;

③冰和干冰都是由一种物质组成的物质,是纯净物,都是由不同种元素组成的纯净物,又是化合物,故③正确;

④不锈钢和目前流通的硬币都是由两种或两种以上的金属组成的,是合金,故④正确;

⑤盐酸中含有水和氯化氢,属于混合物;食醋是含有醋酸和水,属于混合物,故⑤错误;

⑥纯碱是由钠离子和碳酸根离子组成的化合物,属于盐;熟石灰属于碱,故⑥错误;

⑦豆浆、雾、烟分散质粒子直径在1nm~100nm之间,是胶体,故⑦正确;

⑧胶体有丁达尔效应,溶液没有,故利用丁达尔效应可以区分溶液和胶体,故⑧正确.

故选B.

探究题
阅读理解

We have all experienced days when everything goes wrong. A day may begin well enough, but suddenly everything seems to get out of control. It seems as if a single unimportant event may cause a number of things to happen. Let us suppose that you are preparing a meal and keeping an eye on the baby at the same time. The telephone rings and this means your troubles are beginning. While you are on the phone, the baby pulls the table-cloth off the table, destroying your prepared meal. You hang up hurriedly and attend to your baby. Meanwhile, the meal gets burnt. As if these were not enough to bring you to tears, your husband arrives unexpectedly bringing three guests to dinner.

Things can go wrong on-a number of people on the road. During the rush hour one evening, two cars hit each other and both drivers began to argue. The woman driver behind the two cars happened to be a learner. She suddenly went into a panic and stopped her car. This made the driver following her stop suddenly. His wife was sitting beside him holding a large cake. As she was thrown forward, the cake went right through the window and landed on the road’. Seeing a cake-flying through the air, a truck driver had to stop his truck all of a sudden. The truck was carrying empty beer bottles and hundreds of them slid off the back of the truck and fell onto the road. This led to yet another angry argument. Meanwhile, the traffic piled up behind. It took the police nearly an hour to get the traffic to move again. In the meanwhile, the truck driver had to sweep up hundreds of broken bottles. Only two dogs were enjoying themselves from the accident; for they were happily having what was left of the cake. It was just one of those days.

小题1:What does the writer mainly tell us?

A.Troubles always happen at the same time.

B.Everyone may have trouble every day.

C.A small matter can cause great trouble.

D.Only the lucky man won’t have any trouble every day.小题2:according to the passage, what should be the correct order?

(1) The woman driver stopped her car suddenly.             •

(2) The driver’s wife dropped her cake on the road.

(3) Only two dogs were happy.

(4) Two cars hit each other.

(5) The truck driver had to sweep up hundreds of broken bottles.

A.(2)(3)(3)(5)(1)

B.(4)(1)(2)(5)(3)

C.(3)(5)(2)(4)(1)

D.(1)(4)(2)(3)(5)小题3:Which of the following is true?

A.The woman’s husband brought three guests home to dinner unexpectedly.

B.The meal got burnt.

C.Her baby pulled the table-cloth off the table.

D.It is not strange to experience such accidents.小题4:What does the word "these" in the last sentence of the first paragraph refer to?

A. Your husband brings three guests to dinner unexpectedly.

B. The meal gets burnt.

C. The baby pulls the table-cloth off the table.

D. Both B and C.