单项选择题

In deaths (associated with) automobile airbags, (that) at highest risk have been children and infants (riding) in the front passenger seat and smaller adults sitting (close) to the steering wheel.（）

A.associated with
B.that
C.riding
D.close

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(The university hospital’s) research department (is looking for) volunteers (who) have heart disease, have undergone an open-heart surgery, have had angioplasty (血管硬化), (or a heart attack was experienced).（）

A.The university hospital’s
B.is looking for
C.who
D.or a heart attack was experienced

单项选择题

(Low-level) cumulus clouds, mid-level altostratus clouds, and high-altitude cirrus clouds all (conveys) (information about) (their) atmospheric realms.（）

A.Low-level
B.conveys
C.information about
D.their

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