单项选择题

The course is very popular and the quotas are limited, so it's best to ______ as soon as possible.

A．enroll
B．subscribe
C．absorb
D．register
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单项选择题
The results of the experiments were ______ and they will have to be done again.
A．comprehensive
B．alternative
C．deliberate
D．ambiguous
单项选择题
The sky was so clear in fact that the communications crew and recovery team could watch the balloon ______ to its maximum altitude with the naked eye.
A．hike
B．elevate
C．escalate
D．ascend
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