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【简答题】
Morphine结构中B/C环（），（）呈反式，（）呈顺式，环D为（）构象，（）呈半船式构象，镇痛活性与其分子构型密切相关。
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举一反三
【单选题】If you don't go after what you want, you will never have ________.
A.
one
B.
it
C.
them
D.
these
【简答题】What does Lucy Chang work now?
【单选题】You should exercise more, and you see you’re already out of ________ breath after completing such _______ small task.
A.
a; the
B.
the; a
C.
/; a
D.
/; the
【单选题】If you are tired when you fly south or north,
A.
you will feel better after some sleep
B.
you should go to see a doctor
C.
you should do some exercise
D.
you should eat more
【单选题】What does the woman discover when she looks at the records on the computer?
A.
The man changed his major from art to business.
B.
The man isn't living on campus.
C.
The man is a new student.
D.
There are two students named Robert Smith at the school.
【单选题】After you sail __________ the river, you will see a park, walk __________ the park then you'll find it. [ ]
A.
cross, through
B.
across, across
C.
across, through
D.
through, across
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