问题 填空题

基因突变是由于DNA分子中发生碱基对的__________、__________或__________,而引起的基因结构的改变。基因突变若发生在生殖细胞中,将遵循___________传递给后代。若发生在体细胞中的突变,一般____________。

答案

替换  增添  缺失  遗传规律  不能遗传 

阅读理解

阅读理解。

     I really like the Seaview Hotel. It's quite big. It has two hundred rooms. It's only a hundred metres from

the sea. Bed and breakfast for one night is eighty pounds per person. The staff (服务员) are friendly and the

rooms are very clean. It's a nice hotel. The only problem is that it's not near any shops. You have to get a taxi

or a bus if you want to buy presents to take home.

     The Falcon Hotel has eighty rooms. One night with breakfast is seventy-two pounds. It's only seventy

metres to the shops but you have to get a bus to the beach because it's six kilometers from the hotel. The

staff aren't very friendly and the rooms aren't very clean.

1. How many rooms does the Seaview Hotel have?

                                                                                                                                             

2. Which one is nearer to the sea? How many meters is it nearer than the other one?

                                                                                                                                             

3. What' the Seaview Hotel's problem?

                                                                                                                                              

4. How much do we have to pay for one night with breakfast if we live in the Falcon Hotel?

                                                                                                                                              

5. Why does the writer not like the Falcon Hotel? 

                                                                                                                                              

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