It is easy for many kinds of insects to live in the desert because ______.
A.They only need a little food to survive
B.they are not afraid of the heat
C.They are too small to be attacked by other animals
D.they have a skin which is against water
第4题
下列以载体为中介的易化扩散的特点中,错误的是
A.有结构特异性
B.有饱和现象
C.逆电一化学梯度进行
D.存在竞争性抑制
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