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.
#18252
A
abrupt
B
alternative
C
authentic
D
abstract
推荐题目
The policeman’s______ traffic directions made all the drivers quite ______ .
#18774
A
confused; confused
B
confusing; confusing
C
confusing; confused
D
confused; confusing
The ______ look on the manager’s face suggested that he _______ to overcome the difficulty.
#19158
A
determined; be determined
B
determined; was determined
C
determining; determine
D
determining; determined