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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】在护照上加注 ADS 签证后,护照持有者必须________。
A.
在该签证国停留三天以上
B.
持有离开该签证国的机票
C.
在该签证国一国旅游
D.
证明带有 250 美元以上货币
【单选题】The concept of "environment" is certainly difficult and may even be misunderstood; but we have no handy substitute. It seems simple enough to distinguish between the organism and the surrounding envir...
A.
biological factors are less important to the organism than cultural factors
B.
man and other animals are modified equally by the environmental forces
C.
man is modified by the cultural environment as well as by the natural environment
D.
physical and biological factors exert more influence on other organisms than on man