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【单选题】From the first paragraph, we know that many animals ______.
A.
are safe to pet
B.
respond favorably to rewards and affection
C.
can be trained in the wild
D.
should not be kept in zoos
【简答题】Should parents ever hit their children? Research suggests many of us are likely to respond “no”, and public support for spanking (打屁股) has been falling over the years. But surveys also show that 75 pe...
【单选题】下列关于被动转运的描述，错误的是
A.
药物跨过细胞膜不耗能
B.
药物跨过细胞膜没有饱和限速
C.
药物跨过细胞膜存在着相互竞争的制约
D.
是药物跨过细胞膜的主要转运方式
E.
它包括简单扩散及滤过
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