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【判断题】
品种具有相对的遗传稳定性和生物学及经济学上的一致性A.
正确
B.
错误
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举一反三
【单选题】Double Eagle Ⅱ, the first trans-Atlantic balloon, was greeted by avid crowds in France.
A.
eager
B.
surging
C.
appreciative
D.
vigorous
【判断题】Double drum first emerged in China's interior and spread to the Korean Peninsula later, becoming the main percussion instrument.
A.
正确
B.
错误
【单选题】He wrote Silly Mammo, which was the first Amharic-English children's book.
A.
Restrictive relative clauses
B.
Nonrestrictive relative clauses
【单选题】果胶酶常在0～4℃下保存。其原因是 [ ]
A.
此温度条件下，酶的活性最高
B.
此温度条件下，酶变性失活
C.
低温可降低酶的活性，但酶不变性失活
D.
自然条件下，果胶酶常在0～4℃下发生催化作用
【单选题】____ the age of six, Hu Lin won the first prize in the drum kit competition.
A.
in
B.
at
C.
on
D.
for
【简答题】( ) (n.) something that is made for the first time
【单选题】Double Eagle II, the first transatlantic balloon, was greeted by avid crowds in France.
A.
eager
B.
surging
C.
creative
D.
vigorous
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