Air and water __ are still serious problems in many developing countries.

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Air and water     __   are still serious problems in many developing countries.      [     ]
A. pollution
B. accident
C. development
D. height

答案

举一反三

We must realize the _____ of protecting our environment. [ ]

A. difference
B. development
C. importance
D. pleasure

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If anyone comes to see me this afternoon, please ask him or her to leave a        .      [     ]
A. letter
B. message
C. sentence
D. notice

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—Please give me a          when you arrive.
—OK.I’l1 tell you everything as soon as I get there.      [     ]
A. ring
B. present
C. hand
D. ricle

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—Why didn"t you buy a ticket for your son?
—They allow a(n)_____to take a child under 1.2 m onto the train for free.   [     ]
A. kid
B. teenager
C. expert
D. adult

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He is going to the town for the _____of buying a computer for his son.    [     ]
A. advice
B. need
C. purpose
D. desire

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