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【多选题】
棉花叶片的结构有( )特点。A.
有栅栏组织和海绵组织之分
B.
四个细胞构成气孔器
C.
上下表皮细胞的正面观为长短细胞相间排列
D.
主叶脉维管束内有形成层
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【单选题】 The business representative will arrive at 9 a.m., ________ he will meet us at office.
A.
when
B.
that
C.
which
D.
where
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