单项选择题

The small, local labor organizations of the first half of the (nineteenth) century were (influentially) in (calling) attention to the (extremely) long working day.（）

A.nineteenth
B.influentially
C.calling
D.extremely

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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

单项选择题

(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

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