In a breakthrough, scientists have found an economically viable way to (17)__________ fuel from water by splitting it into oxygen and hydrogen. Just as solar light can generate electricity, the water splitting process could do the same via the generation of clean chemical fuel such as hydrogen. “It is already (18)__________ possible to split water in this way”, researchers said. The world is now (19)__________ five major issues for humanity – energy, environment, water, food, security and public health. Global warming is ranked first and it is all resulting (20)__________ burning fossil fuels because that is where carbon dioxide comes from. To reduce this, you have to find clean, renewable energy and hydrogen equals clean energy. It’s part of the solution – if we really can (21)__________ water into that will be one scientific solution for the future sustainable energy supplies, hydrogen would be a (22)__________ clean fuel over petrol in foreseeable future.
- A. do B. study C. create D. destroy
- A. scientifically B. scientific C. science D. scientist
- A. meeting B. looking C. facing D. having
- A. of B. to C. by D. from
- A. divert B. transfer C. require D. split
- A. synthetic B. promising C. obvious D. hopeful
