After the passage the author will talk about______.
A.the principles of designing lenses
B.techniques of making contact lenses
C.the design of photographic lenses
D.styles of lenses
A) to trap the opponent's lenses
B) to focus light with lenses
C) to handmake lenses at low cost
D) to reflect light by means of curved surfaces
本题为单选题,请给出正确答案及解析,谢谢!
A) the principles of designing lenses
B) techniques of making contact lenses
C) the design of photographic lenses
D) styles of lenses
本题为单选题,请给出正确答案及解析,谢谢!
A.are two lenses there
B.two lenses are
C.are two lenses
D.two lenses are there
Which of the following words cannot be used to describe today's lenses?
A.More delicate.
B.Cheaper.
C.Numerous.
D.Unpopular.
The computer has dramatically affected just like photographic lenses are constructed.
A.is the way we constructed the photographic lenses.
B.that the way we constructed the photographic lenses.
C.which way do photographic lenses are constructed.
D.the way photographic lenses are constructed.
The final goal of designing a lens is______.
A.to trap the opponent's lenses
B.to focus light with lenses
C.to hand-make lenses at low cost
D.to reflect light by means of curved surfaces
The computer has dramatically affected just like photographic lenses are constructed.
A.is the way we constructed the photographic lenses.
B.that the way we constructed the photographic lenses.
C.which way do photographic lenses are constructed.
D.the way photographic lenses are constructed.
One cause of eyestrain mentioned in the passage is ______.
A.wearing contact lenses too long
B.going to the movies
C.reading a lot
D.not visiting your eye doctor
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