reduce the pressure on me. 可知Dong Tianbo打扫房间是为了减轻压力, 故选D。

【拓展训练】根据阅读理解A完成下列习题

Ⅰ. 从文章中找出以下短语并写出它们的意义

1. a step-by-step operation　　　　 _____________

2. be prepared by _____________

3. as far back as 1, 000 years ago _____________

4. study genetic information _____________

5. family history _____________

6. pass the information on to _____________

答案：1.一步步的操作

2.由......准备

3.可以追溯到1 000年以前

4.研究基因信息

5.家史

6.把信息传递给......

Ⅱ. 句式仿写

1. A test involving more than 20 islands in the Pacific Ocean produced similar results.

仿写: 一份涉及在这所学校200多个学生的调查显示出不同的结果。

_________________________________________________________________

2. Valuable as it may prove to be, there are more traditional ways that people can learn about their ancestry.

仿写: 尽管被证明有用, 这种方法仍然有很多劣势。

_________________________________________________________________

答案：1. A survey involving more than 200 students in the school showed different results.

2.Useful as it proves to be, the way still has many disadvantages.