单项选择题

In most places, the edges of the continents slope gradually before making a sharp drop to the ocean floor.

A. random
B. sudden
C. dangerous
D. brief
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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
The sensation of a lump in one's throat arises from an increased flow of blood into the tissues of the pharynx and larynx.
A. explanation
B. disease
C. feeling
D. unpleasantness
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