作者：Vocabulary Builder 来源：沪江英语 2015-05-11 15:45
1. Topical or not , it has given me community that I never had before.
2. Smoking is thought to increase the risk of an ectopic pregnancy by up to four times.
3. We live in communities which require cooperation , and it would be utopian to expect all the necessary cooperation to result from spontaneous impulse.
4. The group 's economic geography is as spectacular as its topography.