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【单选题】
Studies in a high school in US show that overgrowth is common in__________. [ ]A.
adolescents
B.
grown-ups
C.
passers-by
D.
strangers
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【简答题】Emily felt increasingly uncomfortable under the woman's steady ______ .
【单选题】What is the man's purpose in calling the woman?
A.
To seek her permission.
B.
To place an order for robots.
C.
To request her to return at once.
D.
To ask for Tom's phone number.
【简答题】用EDTA滴定Ca2+、Mg2+总量时，以作指示剂，溶液的pH值必须控制在；滴定Ca2+时，以作指示剂，溶液的pH值则应控制在。
【单选题】The man felt funny about his ear. What did the woman explain to him?
A.
It's the air pressure.
B.
His ears have some problem.
C.
He is hungry.
【简答题】用EDTA滴定Ca2+、Mg2+总量时,以 为指示剂,溶液的pH必须控制在 。滴定Ca2++时,以 为指示剂, 溶液的pH必须控制在 。
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