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【单选题】
心肌不会产生强直收缩的原因A.
心肌有自律性
B.
心肌呈“全或无”收缩
C.
心肌肌浆网不发达
D.
心肌收缩性较低
E.
心肌的有效不应期特别长
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举一反三
【单选题】It can be learned from the last paragraph that ______.
A.
genetic tests for most of the diseases can be produced now
B.
gene tests are only suitable for those who have a strong family history of disease
C.
almost all diseases can be cured with the development of the gene testing
D.
the writer is optimistic about the future of gene testing
【单选题】Which of the following is the substance mentioned that helps to protect against heart disease?
A.
Lipoproteins.
B.
Cholesterol.
C.
Both.
D.
Neither.
【单选题】After years of research, scientists have ______ the virus that is responsible for the disease.
A.
recognized
B.
identified
C.
guaranteed
D.
notified
【单选题】There is evidence that the usual variety of high blood pressure is, in part, a family disease. Since families have similar genes as well as similar environment, family diseases could be due to shared ...
A.
When salt is added to their diets, rats and men react in much the same way.
B.
The near future will see a cure for high blood pressure.
C.
Modem research has shown that high blood pressure is a result of salt in the diet.
D.
A tendency toward high blood pressure may be a hereditary factor.
【单选题】Dr Kellygave special attention to the case mainly because
A.
it was a rare disease．
B.
he fell in love with the woman．
C.
he was eager to distinguish himself．
D.
he wanted to repay the woman for hergreat kindness．
【单选题】After switching on the computer,_____a floppy dise into the dise drive.
A.
get into
B.
invert
C.
insert
【单选题】________ on dise, avoir une assurance est indispensable.
A.
Quoiqu'
B.
Quoi qu'
C.
Quel qu'
D.
Quelqu'
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