关于三个经济地带的正确叙述是( )
A．东部地带的各省、市、自治区都有海岸线
B．技术创新能力强是东部经济地带各地共同的优势
C．发展第三产业是促进东西部经济发展的重要措施之一
D．环渤海经济地带的经济腹地是指华北地区
答案：C
本题考查我国三大经济地带的发展。A项东部地区北京不是沿海省区；错误。B项技术优势并非所有东部地带的区位优势，比如广西；错误。C项西部的产业结构还不合理，二三产业比重还较低是西部发展的一大限制因素，故大力发展第三产业是促进西部经济发展的重要措施之一。正确。D项环渤海经济地带的北部还连着东北；错误。
Plants are very important living things. Life could not go on if there were no plants. This is 1 plants can make food from air, water and sunlight. Animals and men 2 make food from air, water and sunlight. Animals get their food by eating plants and animals 3 Therefore(因此), animals and men need plants in order to 4 This is the reason(原因) why we find that there are so many plants around us. If you look carefully at the plants around you 5 find that there are many kinds of plants. Some plants are large 6 others are small. Most plants are green.. Some plants have many small leaves. Others have only 7 large leaves. There are many kinds of leaves. Leaves are of 8 shapes(形状) and colors. Leaves are also different in other ways. Some leaves have short leaf stalks(叶茎)while others have long leaf stalks. Still others have 9 stalks at all. The edges(边)of leaves are also different. Some leaves have smooth(光滑的)edges. Some have wave(波状的) edges 10 the teeth of saw(锯).
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