单项选择。Don't ___ so excited. You must be calm (镇静). [ ]A. is B. are C. be D. am -七年级英语

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• --- Linda late for school. --- But she arrives on time at present.A．used to beB．used to beingC．is us
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• — _____ Mary _____ Alice has joined the music club because they have no time.— It’s a pity! A. Both…
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• —________ do you like dogs?—Because they are very cute. A. WhatB. How C. Why-九年级英语
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• Even scientists ___ sure if there are UFOs. [ ]A. aren't B. don't C. can't-八年级英语
• 如图为渤海生态系统简化食物网结构示意图．请据图回答下列问题：（1）该食物网中的生产者是______，若要构成一个生态系统，图中需要添加的成分是______和______．（2）图示食物网中-生物
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• 选择填空。______ you interested ______ such a dangerous job? [ ]A．Do; in B．Are; in C．Are; with -七年级英语
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• 单项选择。Everyone ______ working hard in our school. [ ]A.am B.is C.are D.be -七年级英语
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• 下列各种生物全部为生产者的一组是（）A．蘑菇、酵母菌B．芦荟、大肠杆菌C．水稻、海带D．蜘蛛、绵羊-生物
• 小李调查了某农田生态系统中的部分生物，绘制了如图．请据图回答：（1）该生态系统中属于生产者的有______．（2）图中所有的动物可统称为______．（3）农民投放灭鼠药后，该农田中老鼠-生物
• As we’re students, we __________ obey the school rules.A．canB．mayC．mustD．could-九年级英语
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• There is a saying "No news ____ good news". [ ]A. is B. are C. be D. will be -七年级英语