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【单选题】
有关科学史的叙述中,正确的是A.
1928年,格里菲思的肺炎双球菌体内转化实验证明了DNA是遗传物质
B.
1953年,沃森和克里克利用同位素示踪技术证明了DNA的半保留复制
C.
1910年,摩尔根通过红眼和白眼果蝇的杂交实验证明了基因在染色体上
D.
1866年,通过豌豆杂交实验发现了基因的分离定律和伴性遗传
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举一反三
【单选题】The head of the shop came ___ to see ___.
A.
up; what was the matter
B.
up; what the matter was
C.
along; what’s the matter
D.
down; what the matter was
【单选题】The policeman came up to see_____.
A.
what the matter is
B.
what the matter was
C.
what was the matter
D.
what is the matter
【单选题】What was he doing ______ his father _______ back?
A.
while; came
B.
when; came
C.
when; was coming
【简答题】What happened to the carwhen the man came back? wasbadly damaged．
【简答题】What did children come to her for? Children came to her for ______.
【简答题】What was Dr．Eric before he came to India?
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