夫患常染色体显性遗传病，妻正常，则子女预期危险率为：
A. 1/2
B. 1/4
C. 1/8
D. 1/16
E. 1/32
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Entering the reading room of the library, ______ reading there, preparing for their final exams.
A. a lot of students were
B. Tom found a lot of students
C. a lot of students
D. a lot of students were found by Tom
D. H. Lawrence finally died in
A. England.
B. Italy.
C. Mexico.
D. Americ
What's the attitude of the speaker
A. He doesn't agree.
B. He couldn't agree more than John.
C. He believes it is true.
D. He thinks the price reasonabl
抽取胎儿血液不能诊断：
A. 血友病
B. 半乳糖血症
C. 脊柱裂
D. 镰状细胞贫血
E. β-地中海贫血
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