如图表示呼吸作用过程中葡萄糖分解的两个途径．酶1、酶2和酶3依次分别存在于（　　）

如果$\frac{x}{y}=3$，则$\frac{x+y}{y}$等于(     )

根据所给提示完成句中单词。
--Alice, here are some g ____ for your birthday.   --Thank you.
Jenny wants to get Jay's a____  She is his fan.
Look!  It's going to rain. Take an u____  , please.
Last week was very rainy, and r____ fell every day.
He takes part in a swimming c____.
Every year many ____.(visit) come to Beijing to see the Great Wall.
Ann fell off her bike yesterday.____(luck), she didn't hurt herself.
Jenny wants to be a tennis ____(play) when she grows up.
Yesterday I watched a TV play about____(live) underwater.
We saw some____(real) clever animals in the zoo.

下列各句中，划线的成语使用恰当的一项是（）