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【简答题】
如图表示某农田中生活的几种生物，请据图回答： （1）这个生态系统的能量来自稻的______作用所固定的______． （2）该农田生态系统的生产者是______；在该生态系统中，没有画出的生物还有______． （3）如果大量使用杀虫剂DDT来消灭蝗虫，DDT会在蛇身体内出现吗？为什么？ （4）水稻矿物质营养除来自人类提供外，从自然界获取主要来自细菌、真菌等生物的______．
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【简答题】段落翻译 Simply stated, the Shanghai Expo was a once-in-a-lifetime experience. Maybe it’s because, after visiting the Expo, you would probably tell yourself that you never want to do this again. But once ...
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