单项选择题

Good pencil erasers are soft enough not () paper but hard enough so that they crumble gradually when used.

A. by damaging
B. so that they damage
C. to damage
D. damaging

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单项选择题
The explorer told the boys about his () in the African forests.

A. stories
B. voyage
C. adventures
D. trips
单项选择题
Professor White, my respected tutor, frequently reminds me to______myself of every chance to improve my English.
A．assure
B．inform
C．avail
D．notify
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