词汇运用

1. Researchers in this field ________(有了一些重大的新发现).

2. At what age are children able ________(明辨是非)?

3. A bicycle ________(比汽车更方便) in towns.

4. There was a ________(普遍希望他会赢).

5. The details of today's flights ________(列在显示屏上).

6. The contract had been ________(有效地) drawn up.

7. We ________(收到400份申请) for the job.

8. The ice is too thin ________(承受不住你的重量).

9. The helicopters ________(像两个小黑点出现) on the horizon.

10. Someone ________(轻轻叩门).

11. State your reasons ________(按重要性顺序).

白癜风病因相关的有()

A．遗传学说

B．自身免疫学说

C．神经化学因子学说

D．黑素细胞自毁学说