题目内容

(cosx)'

A. -sinx
B. sinx
C. cosx
D. -cosx

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黄化幼苗的光敏色素含量比绿色幼苗____,光敏色素是一种易溶于水的____。

光敏色素有两种类型: ____和____,其中____型是生理激活型,____型是生理失活____型。

【单选题】The general considered all the information that had been gathered and _________ what possible moves the enemy might make before issuing his orders.

A. guarded
B. guided
C. guaranteed
D. gauged

【单选题】The new president said she would _________ herself to protecting the rights of the old and the homeless, who are otherwise helpless and vulnerable.

A. devour
B. dedicate
C. persuade
D. predicate

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