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【单选题】
测定pH时，通常选择两种标准缓冲液的pH约相差A.
3个pH单位
B.
4个pH单位
C.
5个pH单位
D.
6个pH单位
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【单选题】Dr. Trimble often heard students say that _________.
A.
their mind failed to work when faced with a test
B.
they had difficulty focusing on the test items
C.
they could not think of a way to get rid of test anxiety
D.
they began panicking well ahead of a test
【单选题】听力原文：Dr. Carter is a very busy man. Even so, he often takes time to have a cup of coffee with his colleagues. (24)
A.
Dr. Carter avoids the company of others whenever possible.
B.
Dr. Carter is too busy to have a cup of coffee.
C.
Dr. Carter is a quite sociable person.
D.
Dr. Carter is a lonely man according to his colleagues.
【简答题】Connecting with Patients Dr. Paris often treats several generations of a family over many years. “He’s seen us through two births, one operation, multiple earaches, a broken wrist and a recovery from ...
【简答题】在万能卧式铣床上用三面刃铣刀铣削直角沟槽，若工作台零位未对准，铣出的直角沟槽会（）。
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