单项选择题

The rivers and forests of the New World were ________ with fish and game.

A．sufficient
B．enough
C．adequate
D．abundant
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单项选择题
The heating system has recently been _______ to make it more efficient.
A．modified
B．amended
C．altered
D．changed
单项选择题
Frequent exposure to X-ray is harmful, so the use of X-ray should be limited to occasions when________.
A．primary
B．elementary
C．necessary
D．emergent
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