单项选择题

Insulin(胰岛素), (it is) used (to treat) diabetes(糖尿病) and (is) secured (chiefly from) the pancreas(胰腺) of cattle and hogs.（）

A.it is
B.to treat
C.is
D.chiefly from

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单项选择题
The examination (will test) your ability to understand (spoken) English, to read nontechnical language, and (writing) (correctly).（）

A.will test
B.spoken
C.writing
D.correctly
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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