A. filling
B. emitting
C. wasting
D. polluting
第1题:
A.air
B.feeling
C.atmosphere
第2题:
Radiation is the greatest known danger to explorers in _________
[A] earth
[B] atmosphere
[C] space
[D] environment
是完型填空吧?你要把整篇都传上来这样片面的截句无法给出答案。
第3题:
第4题:
makes our environments tolerable and some ultraviolet rays (紫外线) penetrate the ____
[A] environment
[B] space
[C] atmosphere
[D] earth
是完型填空吧?你要把整篇都传上来这样片面的截句无法给出答案。
第5题:
3.—__________ 1 go out for a while?
—No,you __________ You must finish your homework first.
A. Must,needn't
B. Can,may
C. May,mustn't
D. May,must
第6题:
S7-1200CPU有3种工作模式,分别是()、STOP(停止)、 STARTUP(启动)。