练习题 1 Covering an area of 175 acres , the Palace is enclosed by walls over 35 feet high. 2 The farm was ringing with the sound of the iron gong and they could see the laborers pouring out of
练习题1. This seems mostly effectively done by supporting a certain amount of research not related to immediate goals but of possible consequences in the future.2. New sources of energy must be found
练习题1. Cigarette smoking is believed by most research workers in this field to be an important factor in the development of cancer of the lungs and cancer of the throat. 2. It is to be emphasize