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.
单项选择题
A．Their being built up of stones.B．The shape of the pyramids.C．People’s taking good care of them.D．Effective measures to protect them.
A．Their being built up of stones.
B．The shape of the pyramids.
C．People’s taking good care of them.
D．Effective measures to protect them.
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