under development is the nuclear fusion of certain atoms of hydrogen. This could eventually 20 natural gas as a source of energy.
A. rarely B. transformation C. fuel D. replace
E. led F. alternative G. commercial H. briefly
I. derived J. various K. relieving L. releasing
M. transportation N. financial O. described
答案:11. E 12. F 13. J 14. C 15. I 16. M 17. G 18. A 19. L 20. D
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