题型：语法填空（语篇） 题类：常考题 难易度：困难
江西省赣州市十四县（市）2019届高三上学期英语期中考试试卷
On May 18, it was announced that China had achieved success in drilling fire ice, a frozen (mix) of water and natural gas, from the South China Sea. (official) known as methane hydrates(甲烷水合物), fire ice produces a high amount of energy when (burn) and its chemical reaction produces nothing but dioxide and water.
Fire ice, both clean and energy-intensive, (consider) the fuel of the future. Many countries, including the United States and Japan, have long been conducting research on fire ice, but extracting（提取）it from the bottom of the sea has been a common problem (trouble) all of them. But, the Chinese team succeeded in drilling fire ice for nearly eight successive days, is a big breakthrough.
However, it is too early (say) a new energy source has been found. The world's total fire ice reserve is about 21,000 trillion cubic meters, which, if extracted, could meet the world's energy need
1,000 years. But the successful test drilling of fire ice does not mean it can be extracted for (industry) use. China has to solve many problems before it can use fire ice as a source of energy.
It's thought that only by 2025 at earliest might people be able to look at realistic commercial options.
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