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【單選題】
如果一個氨基酸分子的結構中有兩個羧基，那么這兩個羧基分別位于（ ）
A.
碳原子上和氨基上
B.
碳原子上和R基上
C.
氨基上和R基上
D.
都位于 R基上
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舉報參考答案：
舉一反三
【單選題】What did Tim go out to do?
A.
Buy some books.
B.
Buy a German dictionary.
C.
Return some books to Mike.
【單選題】What’s the most probable relationship between the two speakers?
A.
Passenger and air hostess.
B.
Teacher and student.
C.
Fellow workers.
【單選題】Why does the man want his German dictionary to be back to him as soon as possible?
A.
He wants to return it to his brother immediately.
B.
He wants to look up new words with it.
C.
He wants to use it during the coming final exam.
【單選題】Why is the man leaving the party?
A.
He doesn’t like the party.
B.
He wants to spend time with Lisa.
C.
He wants the woman to give him a lift.
相關題目：
【單選題】What did Tim go out to do?
A.
Buy some books.
B.
Buy a German dictionary.
C.
Return some books to Mike.
【單選題】What’s the most probable relationship between the two speakers?
A.
Passenger and air hostess.
B.
Teacher and student.
C.
Fellow workers.
【單選題】Why does the man want his German dictionary to be back to him as soon as possible?
A.
He wants to return it to his brother immediately.
B.
He wants to look up new words with it.
C.
He wants to use it during the coming final exam.
【單選題】Why is the man leaving the party?
A.
He doesn’t like the party.
B.
He wants to spend time with Lisa.
C.
He wants the woman to give him a lift.
參考解析：
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