To make our city more beautiful, rubbish __ into the river.[ ]A. needn't be thrownB. mustn&#039

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• —Is Lucy knocking at the door? —No. It ______ be Lucy. She is in Japan now. [ ]A. needn't B. mu
• You _swim in this river of the park. It's dangerous ![ ]A. mustn't B. needn't C. won&
• 在生态系统中，有毒物质能够沿着食物链逐渐积累。[]-七年级生物
• 用所给词的适当形式填空。1. You(can) try to do it.2. He spent one hour (do) his homework.3. I saw her(play) when
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• 组成生物体的物质在________________之间的往返循环就是生态系统的物质循环。-八年级生物
• —The room is so dirty. _____ we clean it? '—Of course.[ ]A. Let'sB. Would C. DoD. Shall-七年
• We'll get there at eight, but they _____.[ ]A. aren'tB. didn'tC. won'tD. don
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• 当食草动物摄取食物时，植物体内的能量就会全部流入动物体内。[]-八年级生物
• Your mother looks a bit disappointed. You have told her the truth. [ ]A. doB. must C. can D. want-九年
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• Mr. Green ______ speak a little Chinese, but he can't speak any Japanese.[ ]A. can B. may C. mu
• 某湖泊生态系统中，湖水中的DDT相对浓度为0.5×10-6，现发现各生物体内均有不同浓度的DDT，检测结果如下：检测对象ABCDEDDT浓度/×10-60.0052.00.575.50.04（1）5种
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• —You fly the kites very well.—Thank you. I________ kites when I was 7 years old.[ ]A. can flewB. cou
• It's raining hard outside, so they stay in the classroom.[ ]A. must B. can C. have to D. might-
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• 下列是温带草原上的部分生物：A．植物B．鼠C．蛇D．鹰E．食虫鸟F．植食昆虫，它们通过食物形成的联系如下图。（1）请根据你掌握的知识把以上生物的代号填人方格内。（2）生态系统的四种-七年级生物
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• —Can you come to Susan's party? —Sorry. I ________ look after my grandma.[ ]A. amB. have to C.
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• I _______ like some noodles.[ ]A. does B. hadC. would -九年级英语
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