问题 填空题

萝卜中挖一个大孔,向其中注入饱和食盐水,一段时间后将里面的饱和食盐水倒出,往倒出的食盐水中再加入少量食盐,食盐水的质量会______(增加、减少或不变),倒出的食盐水是______溶液(填“饱和”或“不饱和”).

答案

萝卜中挖一个大孔,向其中注入饱和食盐水,因为细胞外液浓度大于细胞内液浓度,细胞会失水,导致食盐水浓度降低,此时的食盐水已成为不饱和溶液,食盐会继续溶解,食盐水质量会增加.

故答案为:增加;不饱和.

阅读理解

Directions: Read the following passage. Answer the questions according to the

information given in the passage.

Kids and Ponds

Years ago there was a group of kids who would hang around at some local ponds in the woods near their houses in Warwick, Rhode Island. In summer they caught frogs and fish. When winter arrived they couldn’t wait to go skating. Time passed, and the ponds became the only open space for the kids to enjoy themselves in that neighborhood.

One day. a thirteen-year-old boy from this group of kids read in the local newspaper that a developer wanted to fill in the ponds and build over a hundred small houses called condominiums. So the boy went door to door and gathered more than two hundred signatures (签名)to stop the development A group of citizens met and decided to support him.

At the meeting of the town planning board (委员会),the boy was quite nervous at first and spoke very softly. But when he saw the faces of his friends and neighbors in the crowd and thought about what was happening to their favorite ponds,his voice grew louder. He told the town officials that they should speak for the citizens. He also insisted that they should leave enough space for children. A few days later,the developer stopped his plan.

Nine years later, when that teen was a senior in college, he was informed that the developer was back with his proposal to build condominiums. Now twenty-two years old, he was studying wetlands ecology. He again appeared before the town planning board. This time as an expert witness, he used environmental protection laws to explain restrictions on development in and around wetlands and the knowledge of wetlands ecology to help improve the development. Finally some condominiums were built, but less than half the number the developer wanted. The ponds where those kids used to hang around were protected by a strip of natural land,and are still there today.

小题1:What did the kids like to do at the local ponds in winter?

(No more than 6 words)                                               (2 marks)

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小题2:How did the boy win the citizens’ support?

(No more than 10 words)                                              (2 marks)

_______________________________________________________________________________

小题3:What did the boy tell the town officials?

(No more than 16 words)                                               (3 marks)

_______________________________________________________________________________

小题4:What helped the boy to protect the ponds successfully nine years later?

(No more than 12 words)                                                (3 marks)

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选择题