单项选择题

Dust storms most often occur in areas where the ground has little vegetation to protect（） of the wind.

A. from the effects
B. it the effects
C. it from the effects
D. the effects from it

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Early signs of ______ seen in the herbal medicine study are extremely encouraging and based upon these data, we are now planning a registration program.
A. faculty
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C. deterioration
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I was told （） e-mail the hotel for reservations.

A. either to call or to
B. that I should call or to
C. to either call or to
D. I ought either to call or
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