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【单选题】

The degree of congestion which tourists will tolerate before the site begins to lose its appeal is called( ).

A.
the psychological capacity
B.
the physical capacity
C.
the safe capacity
D.
the ecological capacity
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参考解析:
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举一反三

【单选题】Why does the author compare the aforced riders,, to second-hand smokers?

A.
They have little responsibility for public health problems.
B.
They are vulnerable to unhealthy environmental conditions.
C.
They have to bear consequences they are not responsible for.
D.
They are unaware of the potential risks they are confronting.

【单选题】经雄激素治疗后,首先升高的是

A.
红细胞计数
B.
白细胞计数
C.
网织红细胞计数
D.
血清铁蛋白
E.
血小板计数

【多选题】我国关于野生植物的法律制度包括【 】

A.
野生植物进出口许可制度
B.
重点保护野生植物采集证制度
C.
野生植物分级保护和名录制度制度
D.
野生植物资源档案制度
E.
重点保护野生植物监视制度