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【单选题】
What we want is an environmentally friendly car, especially ____ is good on gas. [ ]A.
one
B.
one which
C.
which
D.
one that
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【单选题】sign( )是符号函数，变量X的值为1000，则表达式样10<=X&100==sign(-100)的值为< /div>
A.
1000
B.
100
C.
0
D.
1
【单选题】I soon found that the work I was doing had already been done by someone else.________，I was wasting my time.
A.
In other words
B.
In a word
C.
First of all
D.
Believe it or not
【单选题】. I soon found that the work I was doing had already been done by someone else - ________, I was wasting my time.
A.
in a word
B.
in all
C.
in other words
D.
in words
【简答题】Skin-diving( 潜水 )is a new sport today. This sport takes you to a new wonderful world. It is like a visit to the moon! When you are under the water, it is easy for you to climb big rocks ( 岩石 ),because...
相关题目：
【单选题】sign( )是符号函数，变量X的值为1000，则表达式样10<=X&100==sign(-100)的值为< /div>
A.
1000
B.
100
C.
0
D.
1