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叶绿体是进行光合作用的质体，它只存在于植物叶肉细胞中。( )

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What is the best topic of the passage？

A. John Kennedy and His Prominent Family．
B. The Political Influence of Kennedy Family．
C. The Success of the Youngest American President．
D. John Kennedy，the Most outstanding President．

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Anna：__________，where is the post office，please？Lily：Let me see．Go straight for a few minutes，then turn left，you’ll see lpost office． Anna：Thanks a lot． Lily：You’re welcome．

A. Excuse me
B. Hello
C. Good morning
Do you know

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John：Oh，I‘m late．I must be leaving now． Mary：Do you have to go soon？John：Yes．I have an appointment in l5 minutes． Mary：__________．I‘ll drive you wherever you have to 90．

A. Take it easy
B. Don’t worry
C. Never mind
D. All right

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无丝分裂比较简单、快速，分裂时不形成纺锤丝，又可称为直接分裂。( )

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