单项选择题

Our manager is ______ an important customer now and he will be back this afternoon.

A．calling on
B．calling in
C．calling up
D．calling for
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单项选择题
If people feel hopeless, they don t bother to ______ the skills they need to succeed.
A．adopt
B．acquire
C．accumulate
D．assemble
单项选择题
During the process, great care has to be taken to protect the ______ silk from damage.
A．sensitive
B．tender
C．delicate
D．sensible
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