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
According to the author, who is starting to play a more involved role in the research process
A．International ethics organizations.
B．Local governments.
C．Underprivileged groups,
D．Local scientists.
单项选择题
Why does the author suggest that some people are urged to defer in discussions of international research
A．Because there is a lack of equality between the relevant parties.
B．Because of pressure from the local communities.
C．Because of pressure from the international community.
D．Because there is a temptation to think in their own favor.
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