Most air pollution is caused by the burning of ________like coal, gas and oil.

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Most air pollution is caused by the  burning of  ________like coal, gas and oil.                                   [      ]
A. fuels
B. articles
C. goods
D. products

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举一反三

Under   these ___________   ,it is rather difficult for our products to put a footing on this market.  [     ]
A. situations
B．cases
C. circumstances
D.conditions

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Due to the widespread ___________   of this medical technology, more diseases can be discovered
and treated at an early stage.   [     ]
A. presentation
B.application
C. qualification
D. appreciation

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One of the     _of our planet"s being warming up is an increase in the number of natural disasters.
[     ]
A. reasons
B. causes
C. result s
D. consequences

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These crops need   ______________ the cold weather.    [    ]
A. to protect
B. protection against
C. protecting
D. to protect from

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I made a(n)  ______________  with Mr, Smith to discuss the details of our cooperation. [     ]
A. difference
B. suggestion
C. appointment
D. Announcement

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