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【单选题】
关于核酸正确的叙述是A.
核酸的基本组成单位是核苷的磷酸酯
B.
基本成分是磷酸、碱基和脱氧核糖
C.
DNA无胸腺嘧啶和核糖
D.
RNA无核糖和尿嘧啶
E.
DNA和RNA的结构和功能都不同，但存在部位相同
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【简答题】以糖质为碳源的谷氨酸几乎都是 ( ) 缺陷型,发酵过程中必须加入 ( ) ;但如果添加过量,则谷氨酸发酵转为 ( ) 发酵,因此应将添加量控制在 ( ) 的水平。
【单选题】听力原文： Born Cassius Clay in Louisville, Kentucky, in 1942, Muhammad Ali retired from boxing in 1980. As an amateur, he won 100 of 108 fights. Later, as a professional boxer, Ali was trained by Angelo D...
A.
Liston was claimed winner by decision after only two rounds.
B.
Ali knocked Liston out in the seventh round.
C.
Liston was unable to answer the bell in the ninth round.
D.
Ali was proclaimed champion after six rounds.
【简答题】Ali suggests that staying ______ can help overcome culture shock.
【单选题】对于酸碱指示剂,全面而正确的说法是( )
A.
指示剂为有色物质
B.
指示剂在酸碱溶液中呈现不同颜色
C.
指示剂为弱酸或弱碱
D.
指示剂为弱酸或弱碱,其酸式或碱式结构具有不同颜色
【简答题】In my opinion, Ali is clearly going to be very successful. doubt I ____________________ that Ali is going to be very successful.
【简答题】情境:你给苏打电话,她不在,别人接的电话。你想知道下列三件事: a. Where has she gone? b. When will she be back? c. Did she go out alone? 完成对话: A: Do you know where _____(1)? B: Sorry, I’ve got no idea. A: Never mind. I don’t suppos...
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