亚洲复杂多样的气候，不会影响到的方面是（　　）

根的伸长主要是由于（   ）。

化简$x\sqrt{-\frac{1}{x}}$得（   ）

A.— Do you have an art room?

—Yes , the art room is on the second floor .

B. Look! This is our playground.

C.—What's on the teacher's desk?

—It's a computer.

D.—Let's go to the garden. Water the flowers.

—Good idea!

E.That's our computer room.