【简答题】阅读理解。 Polar bears live in the coldest environments on Earth-the Arctic. Called 'ice bears'in manyEuropean languages, polar bears depend on the ice that surrounds them for their survival. As the Arctic...

【简答题】种类繁多的生物都生活在一定的环境中，生物与环境相互影响、相互作用，构成了。是地球上最大的生态系统。

【单选题】—When will you come to see me, Dad? —I will go to see you when you _____the training course.[ ]

【简答题】一种生物与另一种生物共同生活在一起，相互依赖，彼此有利，分开后都不能独立生活的现象叫______．地衣是______和______共生在一起形成的．

【单选题】_____ makes that teacher famous is _____ over 92% of his students have been admitted to the state universities.

【单选题】—Is there a fog in the evening ?—There be ．I’ll make a phone call to find it out .

【简答题】Enter a typical high school, and the first thing you see is the front office， where the principal dwells and grades are stored. The front office also reinforces familiar hierarchy(等级制度): principal at ...

【单选题】— Liu Fang, I didn't know you can play the Pipa and Guzheng so well.— Well, actually I ________ it since I was six years old.[ ]

【单选题】To show our respect，we usually have to take our gloves off ________ we are to shake hands with.[ ]

【简答题】一般地说，在一个生态系统中，生物种类越多，营养结构越复杂，自动调节的能力就越　　　；营养级越多，在能量流动中消耗的能量就越　　　。