____some doubt among scientists about the cause of cancer.
#92930
A
It exists
B
There exists
C
There is existing
D
It is existing
推荐题目
I arrived home at midnight, _______ my parents had been waiting for nearly three hours.
#93267
A
at that time
B
by that time
C
at which time
D
by which time
___ we know, in a chemical change, energy cannot be created, ____.
#94863
A
Which, nor can it be destoyed
B
As, neither it can be destroyed
C
As, neither is it able to be destoryrf
D
What, nor is destoryed
--- Mom, I’ m going to the graduation dance tonight but I don’t think I look attractive enough.--- Oh, darling, don’ t worry. _______.
#93409
A
They don’t know what beauty is
B
Nobody will care about it
C
You look perfect the way you are
D
Impossible is nothing
_____merely on what the average is , and you’ll remain average.
#92367
A
Focused
B
Focus yourself
C
If you are focused
D
Focusing