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
In 1492 Christopher Columbus made his first (voyager) to the New World, (probably) landing (on the) island (which) he named San Salvador.（）

A.voyager
B.probably
C.on the
D.which
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
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