自然界中的生物通过激烈的______，______者都生存下来______者被淘

— The classroom is   clean    it was yesterday.

— Sorry, I forgot to clean it.

A．as; as

B．so; as

C．not so; as

D．more; than

Traditionally, college students hold a graduation party to encourage themselves before they _____ on their life journey.

A．give up

B．settle down

C．get through

D．set off

根据汉语提示写单词

1. We have sweaters  in  all colors for  ￥50                 (每件)!

2. —How old is your uncle?

    —He's________(二十八)years old.

3. I am a student. She is        ____(也)a student.

4. There are ten           ____(颜色).

5. I_________(想要)the yellow pants.

我国有四大盆地，位于青海省境内的是[ ]

A．塔里木盆地    

B．柴达木盆地  

C．准噶尔盆地    

D．四川盆地

真空表上的读数表示被测流体的绝对压强比大气压强小的数值。