单项选择题

It (aims to) establish a minimum list of standards that (ought to) (include) in all codes of conduct (covering) labor practices.

A．aims to
B．ought to
C．include
D．covering
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单项选择题
China has established three (nature reserves) to protect (the rare species), covering (a total of) more than 600,000 sq km, an area (40 times of the size) of Beijing.
A．nature reserves
B．the rare species
C．a total of
D．40 times of the size
单项选择题
It is perhaps not an exaggeration (to say) that we shall soon (be trusting) our health, wealth, and happiness to elements with (whom) very name the general public (are) unfamiliar.
A．to say
B．be trusting
C．whom
D．are
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