单项选择题

A．How to care for precious metals.
B．A standard unit for measuring weight.
C．The value of precious metals.
D．Using the metric system.
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单项选择题
A．It has nothing to do with the Internet.B．She needs another week to get it ready.C．It contains some valuable ideas.D．It’’s far from being ready yet.
A．It has nothing to do with the Internet.
B．She needs another week to get it ready.
C．It contains some valuable ideas.
D．It’’s far from being ready yet.
单项选择题
Genetic engineering technology is helpful to improve people’’s health conditions.
A．Y
B．N
C．NG
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