No one knows exactly when the universe came into________. [ ]A. effect

题型：同步题难度：来源：

No  one  knows  exactly  when  the universe came into________.  [     ]
A. effect
B．existence
C．power
D．use

答案

举一反三

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

题型：同步题难度：| 查看答案

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

题型：同步题难度：| 查看答案

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

题型：同步题难度：| 查看答案

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

题型：同步题难度：| 查看答案

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

题型：同步题难度：| 查看答案