教育科研选题存在可行性的条件中，除客观条件和主观条件外，还有一个条件是( )。
A. 必要性问题
B. 可能性问题
C. 能力问题
D. 时机问题
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What subject matter did Monet and Siley usually paint
A. Country scenes.
B. Portraits.
C. Skyscrapers.
D. Animals in nature.
在工程网络计划中，判别关键工作的条件是该工作( )。
A. 结束与紧后工作开始之间的时距最小
B. 与其紧前工作之前的时间间隔为零
C. 与其紧后下作之间的时间间隔为零
D. 最迟开始时间与最早开始时间的差值最小
According to the passage, we can conclude that he Bedouin people ______ .
A. are very faithful and wholly devoted to their country
B. center their lives around their families
C. value women as much as men
D. pay no attention to their social status
Had it not been for my illness I ______ him a helping hand.
A. had lent
B. were to lend
C. would have lent
D. should lend
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