题目内容

Listen to a dialogue and decode the message by finding out the correct choices in brackets according to what you have heard.[音频]Pat 1(Alice, Alex, Alison) came to see Li Hong. They talked about the party last night and the weather. Pat didn’t go to the party because it was so cold and 2(windy, rainy, snowy) . It seemed that he didn’t like the weather here. When Li Hong suggested a3 (walk, talk, work) in the afternoon, Pat thought it was too cold to go out for it was4(fourteen, thirteen, sixteen) degrees Celsius. Li Hong didn’t agree. She said in winter, the weather could be much colder. Last winter, it was 5(three, six, seven) degrees below zero for three 6 (weeks, days, months) and very windy.

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碱性氨基酸等电点正确的是()

A. PI=(PKa1+PKa2)/2
B. PI=(PKa1+PKa3)/2
C. PI=(PKa2+PKa3)/2
D. PI=(PKa1+PKa2+PKa3)/2

不带电荷的极性氨基酸,侧链含有极性基团,溶解度比非极性氨基酸大。

A. 对
B. 错

氨基酸中的氨基均能与亚硝酸作用,产生氨气和羟基酸。

A. 对
B. 错

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