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【单选题】
Nisin具有较好的防腐性能，但它必须在一定的环境下发挥最好的防腐能力。其生物活性随pH升高而 ，溶解度随pH升高而 。A.
升高、升高
B.
升高 、降低
C.
降低 、降低
D.
降低、升高
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反馈参考答案：
举一反三
【单选题】Would you mind______it to me once again?
A.
explaining
B.
to explain
C.
explain
D.
explained
【单选题】I explained on the phone that your request will be considered at the next meeting.
A.
I explained on the phone as your request will be considered at the next meeting.
B.
As I explained on the phone, your request will be considered at the next meeting.
C.
/
D.
/
【单选题】_________ I explained on the phone, your request will be considered at the next meeting.
A.
． When
B.
． After
C.
． As
D.
． Since
【单选题】The sentence wants ____ once more.
A.
explaining
B.
to explain
C.
being explained
D.
explained
【单选题】I explained on the phone that your request will be considered at the next meeting.
A.
I explained on the phone as your request will be considered at the next meeting.
B.
As I explained on the phone, your request will be considered at the next meeting.
【单选题】In general， the old man is generous. But ____， he was mean to an old beggar. A．at once B．once aga
A.
22.In general， the old man is generous. But ____， he was mean to an old beggar. A．at once
B.
once again
C.
for once
D.
once over
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