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.
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单项选择题
A．He is very satisfied with the new job.B．He is afraid of the job.C．He is bored with the job.D．He can earn a lot of money.
A．He is very satisfied with the new job.
B．He is afraid of the job.
C．He is bored with the job.
D．He can earn a lot of money.
填空题
threaten
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