单项选择题

The word "thorny" (Line 5, Para. 1) most probably means" ______ ".

A．prickly
B．difficult
C．misunderstood
D．sharp

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单项选择题

A．overB．forC．underD．with

A．over
B．for
C．under
D．with

单项选择题

According to the first paragraph, one of the concerns related to international biomedical research is ______.

A．whether the experimented treatments should be compared against local standards
B．whether the experimented treatments are shown to be effective
C．when local communities will be able to carry out their own research projects
D．the prohibitive costs involved

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