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

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问题 According to the first paragraph, one of the concerns related to international biomedical research is ______.
The word "thorny"(Para. 1) most probably means "______".

选项 A、prickly
B、difficult
C、misunderstood
D、sharp

答案B

解析 词义判断题。根据后面对问题的具体列举,可以判断出该词应为“困难”的意思。
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