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【單選題】
某蛋白質含a個氨基酸，有b條肽鏈組成，該蛋白質至少含氧原子數為（ ）
A.
a－b
B.
a＋b
C.
2a＋b
D.
2a－b
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舉報參考答案：
舉一反三
【單選題】What’s the woman complaining about?
A.
A noisy office.
B.
A crowded classroom.
C.
A poor relationship.
【單選題】Echo wants to buy a big house for her parents. She is a millionaire and likes big and comfortable house.
A.
B.
C.
D.
E.
【單選題】What can we learn about the hotel?
A.
It was great with a nice view of the sea.
B.
It was comfortable.
C.
It was on a noisy street.
相關題目：
【單選題】What’s the woman complaining about?
A.
A noisy office.
B.
A crowded classroom.
C.
A poor relationship.
【單選題】Echo wants to buy a big house for her parents. She is a millionaire and likes big and comfortable house.
A.
B.
C.
D.
E.
【單選題】What can we learn about the hotel?
A.
It was great with a nice view of the sea.
B.
It was comfortable.
C.
It was on a noisy street.
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