There is nothing _______.[ ]A. worry about B. to worry C.to worried about D. to worry about-八年级英语

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• The best way __________ the work is tostart at once.[ ]A. finishB. to finishC. finishingD. finishes-
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• 下列方案是四个生物小组同学进行实验的设计思路，你认为正确的是()A．提出问题→作出假设→得出结论→设计、实施实验B．设计实验→提出问题→得出结论→作出假设C．提出问题→作出假设-七年级生物
• 被誉为“世界杂交水稻之父”的袁隆平爷爷，利用野生水稻经过多次杂交培育新品种，他采用的主要研究方法是()A．观察法B．调查法C．分类法D．实验法-七年级生物
• Dennis needs more time________ his homework tonight.[ ]A. finishing B. to finishC. finishesD. finish
• The teacher often tells us_____our classroom_____.[ ]A.to keep; to cleanB.keeping; cleaningC. tokeep
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• （7分）回顾探究“光对鼠妇生活的影响”活动过程，回答下列问题。（1）作出的假设是。（2）该实验中的变量是。（3）在设计实验时，要给鼠妇提供黑暗和明亮两种环境，以便对照。每个实验-七年级生物
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• 李时珍是我国16世纪卓越的医学家、药学家，为了纠正古书中关于穿山甲捕食蚂蚁的错误说法，特地跑到山里，认真察看和记录穿山甲的生活习性。主要采用下列哪种方法进行研究()A-七年级生物
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• 对调查的生物，可以有多种归类方法，如可以按形态结构，将生物归为、、和三大类。按生活环境可以分为生物和生物等。-七年级生物
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• 爷爷运用生物科学技术，培育出举世闻名的杂交稻，大大提高了水稻的产量。-七年级生物
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