单项选择题

What contribution does the author feel people must now make

A．Search for new energy sources.
B．Outlaw motor transportation.
C．Accept a new life style.
D．Adopt a new form of government.
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单项选择题
A scientist does not accept statements which are not based on the most complete evidence available. Instead, he always checks, studies and makes experiments carefully and objectively to ______ them.
A．testify
B．verify
C．affirm
D．assert
单项选择题
When Columbus______ America' s shores, he encountered copper-skinned people whom he promptly called Indians .
A．landed
B．landed on
C．landed in
D．landed for
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