Recently people have made great progress in using ____ power of nature to produce____ electricity.
| A．a; the | B．/; / | C．the; / | D．a; an |
相关试题
. Enough attention should be paid to _____ your pronunciation and intonation.
| A．improve | B．improving | C．improved | D．be improve |
Our country is now short of natural gas oil and other forms of_______.
A energy B strength C power D material
Knowing the result of the exam, he went home and lay in bed, ______.
A upset B 
was upset C felt upset D and upset
——Oh,it’s you!I______you.
——I’ve just had my hair cut and I’m wearing new glasses.
| A．didn’t recognize | B．hadn’t recognized |
| C．haven’t recognized | D．don’t recongnize |
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