当计算工期超过计划工期时，可压缩关键工作的持续时间以满足要求，在确定缩短关键工作的持续时间时，宜选择缩短持续时间所增加的费用相对较少的工作。
A. 对
B. 错
How many children die every day from lack of clean drinking water?
About 780 million.
B. About 8,000.
C. About 3,000
D. About 3 million.
What did Deepika realize when she visited rural India?
A. People in India had no access to clean water.
B. The water crisis had become a problem worldwide.
C. India was faced with severe water shortage.
D. She must do something to help the poor people.
What research has Deepika been doing?
A. Water purification.
B. Solar power system.
C. Harmful bacteria.
D. Environmental changes.
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