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.
#18985
A
original
B
alternative
C
convenient
D
staple
推荐题目
In that school, English is compulsory for all students, but French and Russian are _______.
#18657
A
special
B
regional
C
optional
D
original
Those who act against the benefit of the people are _______ to fail.
#19427
A
scared
B
bound
C
dying
D
likely
In a __________ state, the children had a meeting and decided to choose one person to ask for more food.
#17611
A
pleased
B
desperate
C
astonished
D
easy
Would it be ___ for you to pick me up at four o’clock and take me to the airport?
#19266
A
free
B
vacant
C
handy
D
convenient