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【单选题】
下列不是嘌呤核苷酸从头合成直接原料的是A.
CO2
B.
谷氨酸
C.
甘氨酸
D.
一碳单位
E.
天冬氨酸
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
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【简答题】医养结合联合运营模式
【单选题】I was to have a trip abroad if ________.
A.
I had not been fired
B.
I was not fired
C.
my boss won't have fired me
D.
I were not fired
【单选题】听力原文：W: Tony, I just moved into my new apartment, and I need to have the phones hooked up. I have no idea what I am doing. I have to make all these decisions about local, local long-distance, and long...
A.
Lower prices.
B.
More choices.
C.
More competition.
D.
More companies.
【单选题】听力原文：W: Tony, I just moved into my new apartment, and I need to have the phones hooked up. I have no idea what I am doing. I have to make all these decisions about local, local long-distance, and long...
A.
Lower prices.
B.
More choices.
C.
More competition.
D.
More companies.
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