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【单选题】
关于杂音的形成机制,下列哪种是正确的A.
血粘稠度显著增加，发生杂音的倾向亦增加
B.
乳头肌或腱索断裂，断端在心腔内摆动，使血流加速而产生杂音
C.
心脏内发生异常通道，通道越大，杂音越明显
D.
血流通过狭窄或关闭不全的部位可出现杂音
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举一反三
【单选题】According to the author, if people are not intelligent, they____________
A.
usually have negative attitudes towards life
B.
are likely to be slow in understanding things
C.
are sure to respond negatively towards study
D.
reach a lower level on the intelligence standard
【单选题】The word 'workaholic' is used in the passage to have ______.
A.
a positive implication
B.
a negative implication
C.
a neutral meaning
D.
a satirical meaning
【单选题】They have been in love for three years and ______ is announced that their wedding will take place next week. [ ]
A.
what
B.
as
C.
such
D.
it
【简答题】Moreover, such a low level of calories would have a ne______ effect on your brain and body.
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