Some people imagine to leave this fearful world， only to come down to earth. Scientists tell us that of all the stars known in the vast universe， the earth is the only planet on which human beings can survive. But now we are facing the risky problems concerning our existence on earth.
Worldwide environmental deterioration （惡化） is alarming. The earth is plagued with population explosion， energy crisis， lack of food， housing problem and environmental pollution. During the process of industrialization， human beings are pursuing crazily the benefits from the economic growth. Now we have suffered from the results. The overuse of natural resources has affected ecosystem（生態(tài)系統(tǒng)） on earth.
So far some effective results have been achieved. However， this is not enough. To protect our homeland we should show greater concern and pay more attention. Since protecting the earth means guaranteeing the steady development of human societym why should not we preserve the environment as far as possible？
核心剖析 用反問、以提出問題供讀者考慮的結(jié)尾方式，間接闡述了作者的觀點(diǎn)。在經(jīng)過前面的鋪墊、說明之后，這個結(jié)尾方法可行可取，毫無強(qiáng)加于人之感。雖然形式是問句，但是意義卻是強(qiáng)語勢的肯定，具有明顯的強(qiáng)調(diào)作用。以反問結(jié)束全文，往往發(fā)人深省、令人回味、引起讀者思考。
Worldwide environmental deterioration （惡化） is alarming. The earth is plagued with population explosion， energy crisis， lack of food， housing problem and environmental pollution. During the process of industrialization， human beings are pursuing crazily the benefits from the economic growth. Now we have suffered from the results. The overuse of natural resources has affected ecosystem（生態(tài)系統(tǒng)） on earth.
So far some effective results have been achieved. However， this is not enough. To protect our homeland we should show greater concern and pay more attention. Since protecting the earth means guaranteeing the steady development of human societym why should not we preserve the environment as far as possible？
核心剖析 用反問、以提出問題供讀者考慮的結(jié)尾方式，間接闡述了作者的觀點(diǎn)。在經(jīng)過前面的鋪墊、說明之后，這個結(jié)尾方法可行可取，毫無強(qiáng)加于人之感。雖然形式是問句，但是意義卻是強(qiáng)語勢的肯定，具有明顯的強(qiáng)調(diào)作用。以反問結(jié)束全文，往往發(fā)人深省、令人回味、引起讀者思考。