【单选题】听力原文:M: I didn't expect to see you here. W: Francis was sick and asked me to work today instead. Q: What can be concluded from this conversation? (14)
A.
The woman is taking Francis'place at work.
B.
Francis and the woman are working together today.
C.
The woman is expecting to take today off.
D.
Francis asked if the woman was sick.
【单选题】In ____, the double-helix structure of DNA was determined by James Watson and Francis Crick who published their discoveries in Nature.
【单选题】计算机的发展一共经历了4个阶段,第二阶段是指 阶段。
【简答题】分支限界法按(1)策略搜索问题的解空间树。 填空(1)补充完整。
【单选题】1953年James D. Watson和Francis H. C. Crick解决了什么问题