推荐回答（1个）
一、填空(20分)
1、动、植物的生长需要(阳光)、（水）、（空气）等条件.
2、在光的照射下物体影子的（长度）、方向都和光源的（照射）方向有关.
3、动植物都会对它们需要的（环境）进行选择.
4、光是沿（直线）传播的,当它们碰到物体后发生反射,反射光也是沿（直线）传播的.
5、生物之间像链环一样的食物关系,叫做（食物链）,这种关系中能自己制造食物的生物叫（生产者）,直接或间接消费别人制造的食物的生物叫（消费者）.
6、生物在一定区域内相互（消费）,相互依存,形成了一个（食物网）.
7、橡皮筋的弹力越（强）作用时间越长,小车运动的距离越（远）.
8、地球内部可以分为（地壳）、（地幔）、（地核）三部分.
二判断（20分）
1、月亮会发光,也是光源.（错）
2、太阳是地球最大的光源和热源.（对）
3、物体吸热的本领与物体的颜色有关（对）
4、影子的产生必须有光源、遮挡物和屏三个条件（对）
5、影子的方向总是和太阳的方向一致（错）
6、太阳位置最高时,影子最长；太阳位置最低时,影子最短（错）
7、乱砍乱伐是不会干扰生态系统平衡的（错）
8、只要有水,绿豆就会发芽（错）
9、当环境改变时,植物具有一定适应环境的能力（对）
10、蚯蚓喜欢潮湿、阴暗的生活环境（对）
三选择题（10分）
1、光传播的速度很快,每秒约（A）千米.
A、30万千米 B、3万千米 V C、100往年千米
2、下面不是光源的是（A）.
A、月亮 B、蜡烛 C、手电筒
3、萤火虫发光属于（A）
A、冷光源 B、热光源 C、强光源
4、下面的物体吸热最快的是（C）.
A、白色纸 B、粉色纸 C、黑色纸
5、增加（B）可以为生态瓶中的动物提供更多的氧气.
A、水 B、植物 C、动物
6、一天早晨,小明测得一棵大树在阳光的影子长5米,过一小时去测量,小树的影子会（C）
A、不变 B、大于5米 C、小于5米
7、为了维护生态平衡,我们人类应该（B）.
A、乱砍乱伐 B、保护环境 C、任意放牧
8、操场上空飘扬的红旗,它反射的光是（B）
A、红色 B、白色 C、黑色
9、（土壤）是地球上最有价值的资源.
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