单项选择题

A laser beam can be turned into a ______ weapon.

A．dead
B．deathly
C．dying
D．deadly
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单项选择题
Students or teachers can participate in excursions to lovely beaches around the island at regular ______.
A．gaps
B．rate
C．length
D．intervals
单项选择题
Criticism and self-criticism is necessary ______ it helps us to find and correct our mistakes.
A．by that
B．at that
C．on that
D．in that
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