皮皮学，免费搜题
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【单选题】
“伤皮，不怕空心”是因为（ ）A.
树皮中有筛管，可以向上运输水
B.
树皮中有导管，可以向上运输水
C.
树皮中有导管，可以向下运输有机物
D.
树皮中有筛管，可以向下运输有机物
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】—It is nearly six p.m. Will you have dinner here? —Sorry, _______. I have many things to do. [ ]
A.
I mustn't
B.
I can't
C.
I needn't
D.
I don't
【单选题】It is only when you nearly lose someone _____ fully conscious of how much you value him.
A.
do you become
B.
then you become
C.
have you become
D.
that you become
【单选题】It is only when you nearly lose someone fully conscious of how much you value him.
A.
do you become
B.
then you become
C.
that you become
D.
have you become
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