问题 解答题

如图是某生态系统的示意图,请据图回答:

(1)右图所示的生态系统中,获得能量最多的一条食物链是______.

(2)图中太阳光、空气属于生态系统的______部分.

(3)动、植物遗体或者遗物是通过图中细菌分解的,因此该类生物在生态系统的______流动和______循环中起到重要的作用.

答案

(1)食物链正确的表示方法是:从生产者开始到最终(最高级)消费者为止,箭头方向指向捕食者.在生态系统中,能量是沿着食物链单向流动的.能量在沿食物链各个环节的传递过程中逐级递减.在食物链中,营养级别越低,所获得能量越多.此生态系统中,获得能量最多食物链是“绿色植物→螳螂→黄雀→蛇”.(2)生态系统是由生物部分和非生物部分组成的.前者包括生产者、消费者和分解者.非生物成分(即阳光、空气、水、温度、土壤等).图中太阳光、空气属于生态系统的非生物成分;(3)在生态系统中分解者的作用:将动、植物遗体或者遗物分解为无机物,归还到大自然中,因此,该类生物在生态系统的能量流动和物质循环中起到重要的作用.

故答案为:(1)绿色植物→螳螂→黄雀→蛇(2)非生物(3)能量;物质

完形填空

阅读短文,根据短文内容回答问题。(共10分,每小题2分)

Homework is a big part of going to school. Unluckily, homework has to be done outside class—during times when you would probably much rather be doing something else, for example, you like going to a birthday party instead of copying out a whole Chinese text. Luckily, there are several things you can do to make homework less work

First, be sure you understand the task. Write it down in your notebook if you need to, and don’t be afraid to ask questions about what’s expected. If you want, you can also ask how long the special homework task should take to finish, so you can plan your time.

Second, use any small pieces of time you have in school to work on your homework. Many schools have study halls that allow students to study or get homework done. The more work you can get done in school means the less you’ll have to do that night.

What if you don’t have time in school to get homework done? You’ll need to think about how much homework you have for a given night and what else is going on that day, and then plan your time. Most high school students have more than two hours of homework a night. If it’s a heavy homework day and it seems like you got a task in every subject but gym and lunch, you’ll need to spend more time on homework. It’s a good idea to come up with some kind of homework timetable, especially if you enjoy sports or activities or have an after-school job.

小题1:Is homework a big part of going to school?

小题2:What do students like doing outside class?

小题3:Where can students study or do their homework in school?

小题4:How long do most high school students spend on their homework a night?

小题5:What advice does the writer give students on homework in the passage?

单项选择题