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
We Chinese can work wonders, that is, we can make ____.
#20919
A
impossible possible
B
the impossible possible
C
impossibly possible
D
the impossible possibly
He has not got a fever. That is to say, his temperature is _______.
#19671
A
common
B
normal
C
ordinary
D
low
Fred is second to none in maths in our class, but believe it or not, he _______ passed the last exam.
#20642
A
easily
B
hardly
C
actually
D
successfully
Calculations，which are astronomically exact，have been made ________ with the use of computers.
#17738
A
possible
B
it possible
C
possibly
D
to be possible
We should always keep in mind that ______ decisions often lead to bitter regrets.
#20816
A
hasty
B
instant
C
prompt
D
rapid