单项选择题

Mr. John may succeed in losing weight if ____________.

A．he goes back to the health club
B．he stops worrying too much
C．he sticks to a program long enough
D．he makes good excuses for his purposes

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单项选择题

We learn from the text that corals depend on plants for ____________.

A．comfort
B．light
C．food
D．oxygen

单项选择题

The underlined word they in the last sentence of the first paragraph refers to ____________.

A．birds and parasites
B．birds and sheep
C．parasites and sheep
D．sheep, birds and parasites

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