单项选择题

The President made a brief visit to Beijing.

A. short
B. working
C. formal
D. secret
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单项选择题
Penguins do not suffer from the cold in Antarctica because their feathers secrete a protective oil.（）

A. hide
B. warm
C. produce
D. absorb
单项选择题
He is absent because he is sick.（）

A. bad
B. good
C. well
D. ill
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