单项选择题

以下植物细胞，具有细胞壁向内延伸形成丝状器的细胞是( )。
A.卵细胞 B.中央细胞
C.助细胞 D.反足细胞

A.卵细胞
B.中央细胞
C.助细胞
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单项选择题
__________will be asked to call the office SO that the manager can know how the visit will be going．A.You，Mary，John and IB.Mary，You，John and IC.John，You，Mary and ID.I，You，Mary and John
A.A.You，Mary，John
B.Mary，You，John
C.John，You，Mary
D.I，You，Mary
单项选择题
Each year the two friends wrote to each other less and less and eventually their friend-ship__________．A.fell outB.broke offC.cut offD.held out
A.A.fell
B.broke
C.cut
D.held
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