1. All Y chromosomes in existence today are descendedfrom a single ancestor 's who is thought to have lived about140000 years ago.
A.a single ancestor's who is thought to have lived
B.a single ancestor's who was thought to live
C.a single ancestor whom it is thought had lived
D.the Y chromosome of a single ancestor who is thought to have lived
E.the Y chromosome of a single ancestor whom it wasthought had lived
Combining enormous physical strength with higher intelligence, theNeanderthals appear as equipped for facing any obstacle the environmentcould put in their path, but their relatively sudden disappearanceduring the Paleolithic era indicates that an inability to adapt to someenvironmental change led to their extinction.
A)appear asequipped for facing any obstacle the environment could put in their path,
B)appear to have been equipped toface any obstacle the environment could put in their path,
C)appear as equipped to face any obstacle the environment could put intheir paths,
D)appeared as equipped to face any obstacle the environment could put intheir paths, | 
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发表于 2011-12-19 02:08:37
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