【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。
________________________________________________________________________
________________________________________________ ______ __________________
答案：I'm optimistic about life in the future. By that time the surroundings where we live will be more conven ient 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。
________________________________________________________________________
________________________________________________________________________
答案：People will not worry about lack of energy any longer because solar energy，wind energy an d tidal energy will have been made full use of and sea water will be switched into energy as w ell，taking the place of oil.
3．家家都有机器人。机器人可以帮助人们打扫卫生、做饭、照看孩子等。
________________________________________________________________________
________________________________________________________________________
