There was no light on the way and for a second she hesitated,unable to_____the dim fig
A. set out
B. make out
C. pick up
D. clear up
A. set out
B. make out
C. pick up
D. clear up
The source of the sun' s inconstancy is magnetism. Professor William Livingston has developed new theories about its magnetic nature.
"We don' t yet know what causes sun spots, "he says, "but we now think they ' re areas of high level magnetism that come up from the sun' s interior. So strong is their magnetic pull that the highly ionized gas nearby is not able to transmit energy out. "As a result these areas send out less heat and light and thus appear from Earth to be almost dark irregular surface patches.
Sun spot activity generally fluctuates in steady, 11-year cycled. Scientists have long formed the o pinion that as the size and number of sun spots increased, the overall energy sent out by the sun would de crease. Indeed, recent studies confirmed it, revealing that during peak periods of sun spot activity, the Earth experiences a small drop that can be seen clearly in received solar energy.
Could such a small drop in energy have an effect here on earth? Perhaps some scientists think the world temperature could fall by' as much as 0.2 during periods of high solar magnetism.., enough to cause significant fluctuations in weather patterns.
According to the passage, it is believed that the sun ______ .
A.moves in a quick but steady way year after year
B.sends out less and less heat and light with each passing year
C.radiates the same amount of light every year
D.might have a strong influence on the weather patterns
A.Light的Light Transmission设为100%。
B.Light的Light Transmission设为0%。
C.投射阴影层的Light Transmission设为80%
D.接受阴影层的Light Transmission设为100%
Something looks yellow because it ______.
A.absorbs mostly yellow light
B.reflects mostly yellow light
C.absorbs all light
D.reflects all light
A.Stop and wait at a red light
B.Go at a green light
C.Slow down and stop at a yellow light