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【单选题】
已知等差数列 中, 是方程 的两根, 则 等于（ ）A.
B.
C.
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反馈参考答案：
举一反三
【单选题】__________,we must believe in ourselves and believe that we can do something well.
A.
However life is difficult
B.
However is life difficult
C.
However difficult life is
D.
However difficult is life
【单选题】Many people believe we are heading for environment disaster ________ we basically change the way we live. [ ]
A.
if
B.
but
C.
unless
D.
once
【简答题】Many people believe we are heading for environmental disaster ______ we radically change way we live A) but B) although C) unless D) lest
【单选题】If we can not believe in the language in an ad, we should at least believe in the pictures in it.
A.
Y
B.
N
C.
NG
【单选题】If we cab not believe in the language in an ad, we should at least believe in the picture in it.
A.
Y
B.
N
C.
NG
【简答题】To get happiness, we should believe that ______.
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