皮皮学，免费搜题
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【单选题】
凯氏定氮法中测定蛋白质样品消化，添加（）使有机物分解A.
硫酸
B.
盐酸
C.
硝酸
D.
醋 酸
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【简答题】请上传第二遍课文朗读语音。
【简答题】在一局单打比赛中，发球员的分数为0或双数时，双方运动员均应在各自的（）发球区发球或接发球。
【单选题】Jim: I've had a lot of trouble getting through to you. Your call center wouldn't put me through. Clerk: I'm sorry. We've been very busy this morning . What can I do for you ? From the conversation abo...
A.
the phone
B.
calling
C.
the call center
D.
understanding
【简答题】It was raining 1 . I couldn’t see 2 . I drove 3 . Suddenly, I saw a young girl. She was dressed 4 and standing in the middle of the road. I was surprised! Somehow, I stopped the car 5 . “ What are you...
【单选题】.Clerk: Do you know the flight number?Guest: ________________.
A.
Yes, he is Tom
B.
Yes, it’s CA900.
C.
The flight is a direct flight.
D.
Here you are.
【简答题】J5 -9-11 Part three: According to the following directions, try to give a brief presentation to the question. 1. Directions: You work as a waiter in a restaurant. After finishing taking the guest’ ord...
【单选题】Customer: Excuse me.______. Clerk: The rate for airmails is two dollars.
A.
Do you do international delivery?
B.
Can you tell me the money I need to post a letter?
C.
How much is a letter to South Mrica?
D.
Do you happen to know how fast airmails are?
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