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【单选题】
正常菌群的有益作用不包括A.
抗肿瘤作用
B.
免疫作用
C.
合成维生素
D.
与外来菌竞争营养物质
E.
刺激补体的合成
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举一反三
【简答题】.We each ____two hands and each of us____to make a living with our hands. A,have; has B,have;have C,has;has D,has;have
【单选题】She will tell us why she feels so strongly that each of us has a role ________ in making the earth a better place to live. [ ]
A.
to have played
B.
to play
C.
to be played
D.
to be playing
【单选题】She will tell us why she feels so strongly that each of us has a role _______ in making the earth a better place to live on. [ ]
A.
to have played
B.
to play
C.
to be played
D.
to be playing
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