某班同学在《研究光对鼠妇生活的影响》实验中，甲、乙、丙、丁四组同学所使用的鼠妇数 发布时间：2017-05-06 21:55 │ 来源：www.tikuol.com 题型：选择题 问题： 某班同学在《研究光对鼠妇生活的影响》实验中，甲、乙、丙、丁四组同学所使用的鼠妇数量依次是3只、2只、1只、10只，使用鼠妇数量比较科学的小组是（ ）A．丁B．丙C．乙D．甲
题型：选择题 用所给词的适当形式填空，其中有两项多余。feed, fresh, rubber, small, on, control, meat There are a lot of trees around us. The trees can help to make the air 1 and cleaner. They can also help to 2 the weather. They provide(提供) humans with food, 3 , medicine and other things. Because of the trees, many animals can live 4 the earth. But people often cut trees down in large numbers. The forests are becoming much 5 than before, so we should protect them well. 查看答案