单项选择题

A．They might fall into the hands of terrorists.B．They m……

Why are experts worried about the enriched uranium in Eastern Europe and the former Soviet States

A．They might fall into the hands of terrorists.
B．They might cause nuclear pollution.
C．They might be sold to Russia.
D．They might be exchanged for weapons.

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单项选择题In the mass extinction 65 million years ago, ______ of all species on earth vanished.

A．two thirds
B．half
C．90%
D．30%

单项选择题Why was Leacock dubbed as a pro-American British imperialist

A．Because he was a Briton who adored American politics.
B．Because he liked to read American newspapers.
C．Because he lectured on the importance of friendship between U.S. and Britain.
D．Because he chose to live close to America.

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单项选择题According to the author, when young families are isolated, ______.

A．old people can easily accept the change
B．people can move from place to place
C．individuals can hardly become innovative
D．economy develops at high speed

单项选择题He bought a photocopier ______.

A．by accident
B．because he couldn’t find a place to make a photocopy
C．because there was no place nearby to provide the photocopy service
D．because all sorts of people need it