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【单选题】
设函数【图片】在【图片】的某个领域内有定义，则【图片】存在是【图片】在【图片】可导的（ ）A.
充分条件而非必要条件
B.
必要条件而非充分条件
C.
充分条件且必要条件
D.
既非充分条件又非必要条件
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【单选题】All the useful energy at the surface of the earth comes from the activity of the sun. The sun heats and feeds creatures and mankind. Each year it provides men with two hundred million tons of grain an...
A.
gasoline
B.
natural gas
C.
atomic power
D.
animal fat
【单选题】The most important benefit from the property boom is
A.
the criticism from the local press about the affordability of housing in Hong Kong
B.
the increased price of the luxury flats．
C.
the more secure way of controlling the sale of the flat．
D.
the rise in the percentage of mainland borrowers in Hong Kong over the past three years．
【单选题】Why does the groundwater from the north finds its way into the canyon, but the water from the south doesn't?
A.
Because there are fractures in the rocks in the south.
B.
Because the southwest part of the underlying rock beds are a bit lower than those in the opposite direction.
C.
Because the pressure of the upper streams forces the water to flow in from the north and flow away from the south.
D.
The reason is not mentioned in the passage.
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