单项选择题

Scientists are trying to make（）investigation.

A．further
B．farther
C．furthest
D．farthest

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单项选择题

It is times（）our city.

A．as higher as
B．as big as
C．doubled
D．more greater than

单项选择题

It was believed that there was no limit（）the energy resources on our earth.

A．for
B．off
C．to
D．on

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