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单项选择题

A．after
B．before
C．until
D．when
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单项选择题A．Families with cars.B．Americans’ heavy dependence on cars.C．Roads and highways.D．Traffic problems in America.

A．Families with cars.
B．Americans’ heavy dependence on cars.
C．Roads and highways.
D．Traffic problems in America.

单项选择题A．call onB．call forC．call inD．call forth

A．call on
B．call for
C．call in
D．call forth

单项选择题A．to contractB．being contractedC．contractingD．contract

A．to contract
B．being contracted
C．contracting
D．contract

单项选择题A．Most facilities will be closed.B．Only a few facilities will be closed.C．Most facilities will operate on a reduced schedule.D．All facilities will be open.

A．Most facilities will be closed.
B．Only a few facilities will be closed.
C．Most facilities will operate on a reduced schedule.
D．All facilities will be open.

单项选择题A．howB．whyC．whatD．when

A．how
B．why
C．what
D．when