单项选择题

A．By studying the pictures of them.
B．By studying the written material of them.
C．By examining them and the tools used to build them.
D．By examining the structure of them.
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单项选择题
A．Because it comes by mail.B．Because it arrives a few days earlier.C．Because it is much cheaper.D．Because it is inconvenient to buy one from the bookstore.
A．Because it comes by mail.
B．Because it arrives a few days earlier.
C．Because it is much cheaper.
D．Because it is inconvenient to buy one from the bookstore.
填空题
A
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