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

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单项选择题

He is absent because he is sick.（）

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

单项选择题

Clearly, he will win the game.（）

A. likely
B. possibly
C. obviously
D. strangely

单项选择题

The whole idea to build a deluxe hotel here sounds insane to me.（）

A. reasonable
B. sensible
C. crazy
D. unbelievable