this flower is very beautiful改为感叹句

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• It is a very interesting story.(改为感叹句） ( ) ( ) ( ) story it is!
• The tall boy is a very smart student(改为感叹句) _____ _____ smart student the tall boy is!
• They are beautiful clothes.(改为感叹句)答对有奖
• The UN wants to make peace in the world.改为一般疑问句 it s very beautiful.改为复数句子
• They have some beautiful flower.(改为一般疑问句）
• The stamps are very beautiful.改为感叹句
• Their school is very beautiful 改为一般疑问句
• "The children are very wonderful!改为感叹句（如何改）
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• 已知函数f（x）=1/3x3+ax2-bx（a，b∈R），若y=f（x）在区间[-1，2]上是单调减函数，则b-a的最小值为_．
• 已知函数f（x）=13x3+ax2-bx+1（a、b∈R）在区间[-1，3]上是减函数，则a+b的最小值是（　　） A.23 B.32 C.2 D.3