单项选择题

A．To attract more sea animals to the testing site.
B．To drive dangerous sea animals away from the testing site.
C．To help trace the sea animals being tested.
D．To determine how~ sea animals communicate with each other.
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单项选择题
Two recent papers in Science magazine claim to have found evidence which contradicts the traditional notion that _________.
A．relatively harsh environments are the nurseries of evolution
B．evolution occurred in regions with biological diversity
C．new forms of life come into being in near-shore areas
D．species of birch and redwood originated in the south
单项选择题
A．He took the place of a president who resigned his position.B．He had worked for 38 years in Washington DC till 1930.C．He never lost the speech or manners of his hometown.D．He kept two dogs in his ranch in Johnson City, Texas.
A．He took the place of a president who resigned his position.
B．He had worked for 38 years in Washington DC till 1930.
C．He never lost the speech or manners of his hometown.
D．He kept two dogs in his ranch in Johnson City, Texas.
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