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【单选题】
能够利用简单无机物、自我合成有机分子的生物称为A.
自养生物
B.
厌氧生物
C.
异养生物
D.
兼氧生物
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举一反三
【单选题】________ the difficult things happened when I can't adjust myself? [ ]
A.
What about
B.
What with
C.
What if
D.
What for
【单选题】What does the sentence 'The air helps purify the water' illustrate?
A.
The ecological balance.
B.
The water cycle.
C.
The earth's limited resources.
D.
The life cycle.
【单选题】I didn't know what ____ to her last night. [ ]
A.
was happened
B.
happening
C.
happened
D.
was happen
【单选题】I don’t know _____.
A.
what happened to him
B.
what did he happen
C.
what he happened
D.
what was the matter
【单选题】-----What _____? -----I______my key and can't open the door.
A.
happened, lost
B.
has happened, lost
C.
happens, have lost
D.
has happened, have lost
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