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.
| A．primary | B．alternative | C．instant | D．unique |
相关试题
On weekends when Jane comes back home from school, she eats everything in _____.
| A．scene | B．sight | C．view | D．range |
. ---Can I smoke here?
---No. On no condition _____ in the museum.
| A．is smoking permitted | B．smoking is permitted |
| C．was smoking permitted | D． smoking was permitted |
All his attention _____ on the computer game, he even didn’t notice his mother enter the room.
| A．has been fixed | B．was fixing | C．was fixed | D．fixed |
.The two boys are alike in age, but _____ they are as different as day and night.
| A．anyhow | B．besides | C．otherwise | D．moreover |
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