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【单选题】
关于腐殖质，下列说法不对的是A.
化学性质稳定
B.
病原菌消灭
C.
有臭味
D.
含氮量高
E.
有机物
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反馈参考答案：
举一反三
【单选题】The writer states that, until recently, Americans thought of their country as a ______.
A.
source of enlightenment
B.
leader in technological progress
C.
recipient of a European heritage
D.
peacemaker
【简答题】We thought that he is a (journal) ______, but he actually is a writer.
【单选题】The man sitting in his car thought the writer and her husband finished shopping in ten minutes.
A.
Right
B.
Wrong
C.
Doesn't Say
【简答题】y=(1-x 2 ) 100 求导数
【简答题】解下列方程组． （1） 7x+5y ① y=x+3 ② （2） 3x-2y=5 ① x+2y=13 ② （3） 2(x+1)-3(y-1)=10 ① 2(x+1)+7(y-1)=20 ② （4） 2x-y 5 = x+y 3 =3 （5） 3(x-1)-2(2y-1)=7 ① x+2 3 - 1-y 2 =2 ② （6） 25x+17y=91 ...
【单选题】The writer thought that one of the achievements he had was that ______.
A.
he began to love learning
B.
he was promoted in the postal office after getting the diploma
C.
he had learned to ignore negative comments
D.
he had no difficulty when he embarked on a new career
【单选题】The writer thought __________.
A.
he had lost his money
B.
someone had stolen his money
C.
the manager had the money
D.
the girl had stolen the money
【单选题】The writer thought ______ made her father unsociable.
A.
an unhappy childhood
B.
a lack of friends
C.
no interest in hobbies
D.
not smoking or drinking
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