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根据( ) 试验可用于鉴别肠道杆菌有无致病性,一般认为能分解乳糖的是( )菌,不能分解乳糖的是( )菌。
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【简答题】A．We can invent ways of increasing rainfall. B．We can develop ways of reusing water and utilizing sea water. C．We can cut down our consumption of water. D．We can reduce the number of factories produci...
【简答题】A．We can invent ways of increasing rainfall. B．We can develop ways of reusing water and utilizing sea water. C．We can cut down our consumption of water. D．We can reduce the number of factories produci...
【简答题】A．We can invent ways of increasing rainfall. B．We can develop ways of reusing water and utilizing sea water, C．We can cut down our consumption of water. D．We can reduce the number of factories produci...
【单选题】——would you like to go and see the film with me this evening?——I am sorry, I can’t because I ____
A.
18．——would you like to go and see the film with me this evening? ——I am sorry, I can’t because I ________my homework. A．does
B.
did
C.
am doing
D.
has done
【单选题】I’m sorry I can’t cook for you because the supply of gas ____.
A.
has run down
B.
has run away
C.
has run into
D.
has run out
【简答题】Why shouldn’t you be nervous? Because it may affect your _________________________________.
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