1. domestic a. 本国的，国内的；家用的；家庭的
Washington responded by freezing the price of domestic oil.
The store deals in objects of domestic utility.
2. constant a. 不变的，恒定的 n. 常数
In our world nothing seems constant.
The speed of light is an important constant.
3. cliff n. 悬崖，峭壁
He couldn't find a hold on the cliff.
The narrow path zigzags up the cliff.
4. authority n. 权威；当局
We see him as an authority on the subject.
The new building must be financed by the local authority.
5. audio a. 听觉
As with visual feedback, computer games tend to excel at positive audio feedback.
6. attitude n. 态度
She shows a very positive attitude to her work.
7. community n. 社区，社会
Community colleges have become popular and their enrollments have increased rapidly.
The welfare of the community is the same as the welfare of its members.
8. commit vt. 犯（错误，罪行等），干（坏事等）
They committed outrages on innocent citizens.
9. comment n. /vt. 评论
He made no comments on our proposal.
He commented that it was an excellent film.
10. distinguish vt. 区分，辨别
It's important to distinguish fact from fiction.
We should distinguish between right and wrong.
Provide a Better Life for Senior Citizens Now we have a growing population of senior citizens. To ensure happy lives for them has become a focus of attention. Our traditiona
Passage Twenty-five (Exploration of the Titanic) After resting on the ocean floor, split asunder and rusting, for nearly three-quarters of a century, a great ship seemed to