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Scientists believe that apes and people had ancestors 1 though they also believe that human beings are not descended from apes. That evolution has happened is 2 few scientists can doubt. 3 it has happened is something that still is discussed. Most 4 now believe that Charles Darwin went very near the truth in his theory of evolution 5 natural selection. He pointed out that living things 6 . They differ 7 speed, in strength, in all sorts of small way, and many of these difference are 8 , that is, they are passed on to later generations. He also pointed out that an 9 struggle for existence is always going on. In this struggle it is the fittest that 10 and the fittest are those that are best 11 to the life they lead. So creatures which possess variations that 12 survival live and reproduce their kind and those which do not have their variations 13 . In this way the favorable variations will, 14 Darwin, gradually appear in all those animals.
Darwin first thought of his theory in about 1840 but he went on 15 collecting evidence for nearly 20 years.

问题1选项
A.in common
B.out of common
C.commonly
D.with common origin
问题2选项
A.anything
B.something
C.nothing
D.thing
问题3选项
A.What
B.Whether
C.If
D.How
问题4选项
A.psychologists
B.idealists
C.botanists
D.biologists
问题5选项
A.in
B.for
C.with
D.by
问题6选项
A.modify
B.vary
C.verify
D.reform
问题7选项
A.at
B.by
C.in
D.from
问题8选项
A.preserved
B.inserted
C.rehearsed
D.inherited
问题9选项
A.intensive
B.intense
C.impressive
D.intimate
问题10选项
A.improve
B.maintain
C.survive
D.advance
问题11选项
A.adapted
B.adopted
C.exposed
D.defined
问题12选项
A.favor
B.influence
C.initiate
D.govern
问题13选项
A.exhaust
B.die out
C.vibrate
D.withdraw
问题14选项
A.referring to
B.due to
C.on behalf of
D.according to
问题15选项
A.patently
B.patiently
C.partially
D.potentially
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