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【单选题】
粮谷类食物的第一限制氨基酸是（ ）A.
甘氨酸
B.
组氨酸
C.
赖氨酸
D.
脯氨酸
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反馈参考答案：
举一反三
【单选题】He was elected______ president of the company, and _____news came ,in fact, as ______surprise.
A.
a; the ;X
B.
X; the ; a
C.
a; X; the
D.
the; the; a
【简答题】The president came into the classroom (follow) ______ by his secretary.
【单选题】In fact, American people came to love Adams ____________.
A.
whether he was president or not
B.
when he was not a president
C.
before his term ended
D.
when he first became a representative
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