单项选择题

Good advice for collectors is" ______."

A．Never save the first specimen you find
B．Always save the first specimen you find
C．Save the second specimen you find
D．Save all but the first specimen you find

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单项选择题

A young man collected 30 ______.

A．horses
B．frogs
C．cats
D．combs

单项选择题

Tracking down things for a collection is like ______.

A．going on a boat trip
B．going on a camping trip
C．going swimming
D．going on a treasure hunt