一对夫妇有常染色体隐性遗传病，夫妻为携带者，曾生育过一患儿，再生育患儿的预期危险率为
A. 1/2
B. 1/4
C. 1/8
D. 1/16
E. 以上均不对
查看答案
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
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
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