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1. Man,no less than the lower forms of life，_______________（是演化过程的产物）.
2. _______________（不止一个人觉察到）her agitation.
3. ________________（液体密度越大）,the easier it is to float on it.
4. _______________（只有工人的要求得到满足）will they return to work.
5. Had ________________（要不是有水库）we'd never have been able to beat the drought.
答案与解析：
1. is a product of the evolutionary process
2. More than one person has noticed
3. The denser a liquid is
4. Only when the workers' demands are satisfied
5. it not been for the reservoir | 
