光合细菌的培养液和容器不需要进行灭菌就可以直接进行接种()。
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This language study was __________ by Professor Li.
A. undertake
B. undertaken
C. taken
The book made a great __________ on its readers.
A. impact
B. impect
C. perform
The first atom bomb was __________ over Hiroshima.
A. set out
B. set off
C. set about
I look forward to your __________ support.
A. keep on
B. continue
C. continuous