皮皮学，免费搜题
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【单选题】
关于胎盘功能错误的是:A.
在胎盘内进行物质交换的部位主要在血管合体膜
B.
免疫球蛋白G的分子量较大不能通过胎盘
C.
脂溶性高的物质以简单扩散通过胎盘
D.
通过简单扩散进行02,,CO2,交换
E.
血浆蛋白为大分子不能通过胎盘
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皮皮学刷刷变学霸
举一反三
【单选题】What does the author mean by saying 'we are encouraged to hop when we have two perfectly good legs' (Para. 4) ?
A.
We needn't hop because we are healthy.
B.
Only those who have something wrong in their legs can be encouraged to hop.
C.
It's foolish of us to hop when we have two perfectly good legs.
D.
We should use both sides of the brain.
【简答题】BT5: How long does the laundry service take?