【写作素材】
提示：黑体部分用本单元词汇表达。
1．我对未来的生活感到非常乐观。 到那时我们生存的环境将更加舒适漂亮。
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答案：I'm optimistic about life in the future. By that time the surroundings where we live will be more convenient and beautiful.
2．人们再也不会为缺乏能源而发愁，因为到那时，太阳能、风能、潮汐能(tidal energy)已经得到充分利用，海水将取代石油转化成能源。
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答案：People will not worry about lack of energy any longer because solar energy，wind energy and tidal energy will have been made full use of and sea w ater will be switched into energy as well，taking the place of oil.
