单项选择题

Penguins do not suffer from the cold in Antarctica because their feathers secrete protective oil.

A．hide
B．warm
C．produce
D．absorb

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多项选择题

What is this passage about______

A．It is about the American National Parks.
B．It is about the National Park Service.
C．It is about the National Park Service partnerships.
D．It is about the care and preservation of the National Parks in America.

单项选择题

In the Navaho household,grandparents and other relatives play indispensable roles in raising children.

A．dominant
B．exemplary
C．essential
D．demanding

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