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
---Have your working conditions improved? ---No, than before, I’m afraid.
#18886
A
no better
B
a little better
C
not worse
D
no worse
After his journey from Beijing during the National Day, Tom returned school, __________.
#18117
A
exhausting
B
exhausted
C
being exhausted
D
having exhausted
This bird is really lovely， and I’ve never seen ______ one.
#20665
A
a finer
B
a finest
C
the finer
D
the finest
The output of the gold mine is now four times _____ it was before liberation.
#19050
A
that
B
what
C
which
D
than
--- I don’t want to ask him for help, for he is a hard man. --- But, in fact, he is _______ glad to help.
#19046
A
more than
B
not
C
less than
D
much