单项选择题

You can always ______ Jim in a crisis, for he is simply the most helpful person I've ever known.

A．refer to
B．count on
C．cope with
D．run into
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单项选择题
The Adult Vocational College is an opportunity to gain the right qualifications for various careers, for it offers an ______ range of subjects and courses.
A．additional
B．excessive
C．adequate
D．extensive
单项选择题
This hypothesis states that environments that are too clean may actually make the ______ system develop oversensitive responses.
A．mental
B．nervous
C．immune
D．physical
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