We will have no water to drink _________ we don’t protect the earth.A. until B. if C. unless-八年级英语

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• ---How long have you been studying at this school? --- I have been studying here­­­­
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• 将含有草履虫的池塘水置于烧杯中，不久就会发现草履虫都集中在水的表层，原因是草履虫需要（）A．阳光B．二氧化碳C．氧气D．养料-七年级生物
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• ----Have you seen Mr. Black these days, Jack? ----Yes, I met him when I ________ in the street yeste
• We will go to the mountains,if it______this Saturday.A．doesn’t rainB．won’t rainC．isn’t rainingD．didn
• 酿制甜酒要用一种微生物，它是单细胞酵母菌。-七年级生物
• I didn’t know when he back. He said he would call me when he home.A．will come; getsB．came; gotC．woul
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• ---So you were in the supermarket __________ you heard a strange sound, right?---That’s true. I ran
• Last night Dad and Mum didn’t come back home ________ I finished my homework.A．whileB．ifC．untilD．and
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• 下列哪一单细胞生物没有运动能力？（）A．酵母菌B．草履虫C．衣藻D．变形虫-七年级生物
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• 草履虫依靠尾部的摆动在水中运动。-七年级生物
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• 使用显微镜观察草履虫时，经常在临时装片的培养液中放一些棉丝，其作用是（）A．限制草履虫运动B．增加营养C．便于计数D．增加温度-七年级生物
• You will have fun if you _____tomorrow.[ ]A. go hikingB. will go hikingC. went hikingD. are going hi
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• “Simon wants to know if the Class 3 students___ hiking tomorrow.”“Yes, but if it _____ , they’ll vis
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• 单细胞生物必须生活在水中。-七年级生物
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• 结合下图所示生物，回答问题（1）需借助来观察这些生物的内部结构。（2）它们都属于生物，A的名称是。B进行光合作用的场所是，C通过与外界进行物质交换。（3）上述生物中具有细胞壁-七年级生物
• You can’t play with your rabbit ______ you finish your homework.A．becauseB．whileC．afterD．until-八年级英语
• – I don’t know when ________ the day after tomorrow_ I’ll call you when ______.A．he will come; he co
• 下图为草履虫结构模式图，请据图回答：（1）图中②为表膜，相当于细胞的。（2）图中标号①的名称是，该结构与草履虫的有关。（3）草履虫的遗传物质储存在图中标号所示的结构中。（4）一-八年级生物
• 结合图，回答问题。（1）需要借助_____________来观察这些生物的内部结构。（2）他们都属于______生物，A的名称是______，B进行光合作用的场所是_____________，C通过细
• 关于单细胞生物的说法正确的是生物（）。A．能独立完成各种生命活动B．都属于动物类群C．都在一定程度上净化污水D．都必须生活在水中-七年级生物
• 下列哪种生物属于单细胞生物（）。A．蜗牛B．草履虫C．蚯蚓D．蛔虫-七年级生物
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• If it rain tomorrow, I visit my uncleA．doesn’t; willB．does ;/C．/;willD．does; will-八年级英语
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• 整个身体由一个细胞构成的生物，叫做生物，这个细胞能完成生物体的生命活动。-九年级生物
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