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【单选题】
Na + 由细胞外液进入细胞的通道是（）A.
电压门控通道
B.
化学通道
C.
电压通道或化学通道
D.
载体蛋白
E.
缝隙连接
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The author's friend sat down at the side of the road because______.
A.
he was too tired to walk any further
B.
he had had an accident and hurt his leg
C.
he thought the lorry driver would see him clearly there
D.
he wanted to give the lorry driver a reason to stop
【单选题】I felt he was a little _____ with me. Maybe he was too tired and didn’t feel well.
A.
nervous
B.
restless
C.
uneasy
D.
impatient
【简答题】微信营销是指基于微信平台进行的营销活动,其营销主体可以是()或(),主要起到展示宣传和推广销售的作用,不受时间、空间的限制,实现()的营销
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