语法填空

    Green is not always referring to the color. In some cases, it is the term used for environmental____(friend). If you've been expecting to replace your furniture, consider ____(go) green because green furniture offers many benefits. Here are a few tips to get you started on your hunt for the perfect eco-friendly furniture.

    First, green furniture isn't harmful____your health. Also its making process doesn't cause damage to the environment in any way. Besides, by using eco-friendly ____(product), you prevent global warming to some degree in your own way.

    The materials____are used in furniture are what make them green. Materials can be good for the environment ____ because they are renewable resources or they are all ____(nature). A lack of chemicals in furniture also____(mean) it is a better choice for the environment. It may be hard to imagine that a sofa or a table could actually be____green product, but they really can be depending on what they ____(make)of.

    Therefore, when you want to hunt for the perfect green furniture, you should choose the green materials.

进入青春期后，闭锁心理经常会困扰青少年，打开心灵之窗，走出闭锁心理，拥抱灿烂阳光，才有利于我们  健康成长。下列做法中正确的有(       )

①父母越来越不理解自己了，要找机会和他们谈谈心    ②碰到不高兴的事情，尽量闷在心里，不让别人知道

③课堂上没有把老师讲的内容弄懂，主动去请教老师    ④离家出走，独自一人去网吧、游戏厅玩个痛痛快快

有这样一道数学题：90％×90％×90％×90％×90％=59％。它告诉我们，一项工作做到90％已经很不错了，但经过环环相扣的一系列过程结束后，“很不错”的90分最终带来的结果可能是59分——一个不及格的分数，这就是过程控制效应。它启示我们    
①质变是量变的结果，要重视量的积累 ②要抓住时机，实现事物的质变
③要注重系统内部结构的优化趋向     ④要立足整体，发挥整体统率作用

数列0，-1，0，1，0，-1，0，1，…的一个通项公式是(   )

如图表示甲、乙、丙三个种群的数量变化曲线．下列叙述错误的是（    ）