单项选择题

At first, the delivery of color pictures over a long distance seemed impossible, but, with painstaking efforts and at great expenses, it became a reality.

A． transaction
B． transmission
C． transition
D． transformation
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单项选择题
Marketing is () just distributing goods from the manufacturer to the final customer.

A. rather than
B. other than
C. bigger than
D. more than
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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