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【单选题】
关于肺炎链球菌的叙述错误的是A.
革兰染色阳性
B.
革兰染色阴性
C.
荚膜肿胀试验可作为快速诊断
D.
主要引起大叶性肺炎
E.
可引起菌血症
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举一反三
【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.
A.
1943
B.
1948
C.
1953
D.
1958
【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
A.
遗传物质发现
B.
DNA分子的双螺旋结构和半保留复制机制
C.
遗传物质表达
D.
遗传物质种类
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