【正确答案】I thought of the empty lot beneath my building, the dumping site of rusting iron bars. I remember that with the coming of spring, blades of jade green grass would sprout between the iron bars.
【正确答案】Man’ s aging is mainly caused by the death of cerebral cells. However, the cerebral cells of middle-aged and elderly people keep dying every day, man uses up in his lifetime only one fourth of the total cerebral cells,and new cerebral cells will, under normal conditions, keep growing up daily.
【正确答案】Asthma is one of the world' s most common chronic diseases. It affects about 300m people. Yet what triggers any given asthma attack is often unclear and, as a consequence, most asthmatics are not properly treated.
【正确答案】Many believe that science is merely a collection of facts, that it develops by the gathering of these facts and slowly approaches the truth about nature.
【正确答案】I don’ t know what love is like, except parental love. I don’ t know whether it tastes bitter or sweet,sour or pungent. But I know I’ ve developed a very mysterious and deep feeling for him. Isn’ t that feeling named love?