单项选择题
根尖能从土壤中吸收水分和无机盐是因为其表皮属( )。
A.腺毛 B.非腺毛
C.通气薄壁组织 D.吸收薄壁组织
A.腺毛
B.非腺毛
C.通气薄壁组织
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单项选择题
Now almost all the parents want their children to learn the piano or the violin,()their children are willing or not.
A.no matter whether
B.no matter how
C.however
D.whatever
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单项选择题
乳腺癌最易发生的部位是 ( )E.乳房内下象限
A.乳头及乳晕区
B.乳房外上象限
C.乳房外下象限
D.乳房内上象限
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