The atmosphere ____ certain gases mixed together in definite proportion.
A.considering of
B.consists of
C.composes of
D.composed of
A.considering of
B.consists of
C.composes of
D.composed of
The main topic of the passage is ______.
A.composition of the atmosphere
B.pressure from the atmosphere
C.air pollution in the atmosphere
D.the relationship between the atmosphere and men
A.when
B.what
C.that
D.how
The (closer) one (comes) to earth, the (more denser) (the) atmosphere becomes.
A.closer
B.comes
C.more denser
D.the
The best title for this passage would be ______.
A.The Atmosphere and Our Environment
B.Research on Radiation
C.Effects of Space Radiation
D.Importance of Protection Against Radiation
A、off
B、of
C、out
D、forth
______the atmosphere around our Earth, we would not be able to live.
A.Had it not been for
B.Would it not be for
C.If it has not been for
D.If it were not for
A.disputed
B.discarded
C.dismissed
D.distorted
A.burned; disappeared
B.burned; disappearing
C.burning; disappearing
D.burning; disappeared
The largest part of the light energy directed towards the earth is ______.
A.stored up by the plants
B.absorbed by the earth' s atmosphere
C.stored up by the animals in the form. of body fat
D.used for electric power
A.The oil mist detectors
B.The smoke detectors
C.An oily water monitor
D.Oil discharge monitoring and controlling system
Those who celebrate Halloween without knowing its origins may______.
A.not understand Halloween" s true meaning
B.act as strangely as the dead and the devils
C.ruin the atmosphere of the celebrations
D.change their religious beliefs