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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.
