6. As there is less and less coal and oil, scientists are exploring new ways of making use of energy, such as sunlight, wind and water for power and fuel.
#20934
A
primary
B
alternative
C
instant
D
unique
推荐题目
—I’m really hungry now.That’s because you have left your lunch __________.
#20287
A
having untouched
B
to be untouched
C
untouched
D
being untouched
From the _____ expression on her face, we knew that she was very _____ with the result.
#19129
A
exciting; pleasing
B
exciting; pleased
C
excited; pleased
D
excited; pleasing
The ______ you make, the ________ you will make.
#19645
A
more efforts; more progress
B
greater progress; greater efforts
C
more efforts; more progresses
D
many more efforts; much progress
Education in government colleges is very cheap, but if you go to the _____colleges, it is much more expensive.
#18062
A
private
B
personal
C
public
D
personnel
__________the house costs, it will _____________it.
#19085
A
Whatever; be worth
B
However; worth
C
How much; be worthy of
D
What; worthy of