Citizen science is when public volunteers take part in scientific projects by collecting information or monitoring(监测) possible problems and then report their findings back to research groups. This method is meaningful because it allows scientists to get lots of information and better understand animals, nature and more.

As a teenager student, you can join in different kinds of such projects. Below are some great ideas you can consider.

Watch frogs(青蛙)

Join Frog Watch to help monitor wetland frog populations. Your efforts will help scientists check populations and detect any rare or alien kinds early. Learn more at frogwatch.next.fieldscope.org.

Watch stars

The online Galaxy Zoo project lets you look at space photos and put them into different groups by shape so that scientists can learn more about what is in outer space — and you don’t even need a telescope(望远镜)! Visit galaxyzoo.org to find out more.

Count birds

Join the Summer Bird Count from July 20 to August 10. Many citizen scientists will get together and count all the birds they see to help scientists learn more about how birds travel. Visit summerbirdcount.org to get more information.

Take water samples(样本)

Visit monitorwater.org to order a lesson that will teach you how to test water for pH, temperature and freshness. Enter your results on their website to help scientists better understand the state of the world’s water.

1.1.Why do you join a citizen science project?

A To make money.

B To become a scientist.

C To help with science research.

D To train others on scientific knowledge.

解析：选C。C.细节理解题。根据文章第一段对公民科学的定义 “public volunteers take part in scientific projects by collecting information or monitoring possible problems and then report their findings back to research groups” 可知，参与公民科学项目的核心是协助科研工作。A 选项 “赚钱”、B 选项 “成为科学家”、D 选项 “传授科学知识” 在文中均未提及，属于无中生有。

2.2.What should you pay attention to when you watch stars?

A Size.

B Shape.

C Number.

D Quality.

解析：选B。B.细节理解题。定位到 “Watch stars” 部分的内容 “put them into different groups by shape”，明确指出观察星星时需要根据形状对太空照片进行分类，因此答案为 B。A 选项 “大小”、C 选项 “数量”、D 选项 “质量” 均不符合原文表述。

3.3.If you are interested in chemistry, you can visit ______.

A frogwatch.next.fieldscope.org

B galaxyzoo.org

C summerbirdcount.org

D monitorwater.org

解析：选D。D.推理判断题。化学学科会涉及酸碱度（pH）、物质检测等相关内容。文中 “Take water samples” 部分提到，monitorwater.org 网站的课程会教检测水的酸碱度、温度和洁净度，这与化学知识相关。其他三个网址对应的项目分别是观蛙、观星、数鸟，均与化学关联度低。