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为了帮助大家有效备考英语四六级考试，读书人编辑整理了一些资料供大家参考：
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