Reading comprehension is an effective method to check the knowledge you have learned and the language skill you have acquired after you study in Mandarin learning courses. In the following part, the reading exercise with two questions will be provided for you to find the proper answers after reading the paragraph.

睡眠质量好坏与环境因素息息相关。首先，环境绿化要做好。因为绿化好有利于提高空气中得氧气含量，而充足的氧气可使人心情舒畅，从而提高睡眠质量。其次，噪音污染要少。噪音除了影响睡眠质量外，对神经系统等其他系统也有不良影响。最后一点是居室通风要合适。否则，空气中二氧化碳浓度过高，会影响人的大脑功能，从而使睡眠质量下降。

1. 可以对人的神经系统产生不良影响的是：
A． 室内绿化 B. 室内通风差 C. 噪音 D. 室内灰尘
2. 本文的内容可能选自：
A．《居室美化绿化》 B. 《室内空气污染》 C. 《噪音与健康》 D. 《睡眠与环境》

Usually, when you attend to school to study in China, teachers may suggest you to do reading comprehension by following the order of reading questions, scanning the whole text, finding answers and checking answers. After reading the questions, you can get a general idea about the theme of the text. In the first reading of the text, you can pay attention to the conjunctions to understand the relationships of the contents. In the second reading, you can find some sentences that imply the answers and then check them back to the text again.

For the first question, you can focus on the sentence 对人的神经系统产生不良影响 in the text to find the answer. In the text, students who learn Chinese can see the sentence 噪音污染…, 对神经系统等其他系统也有不良影响 which indicate the answer is 噪音. In the second question, you need find the title of this text. After indicating the relationship between 睡眠与环境, the text discusses it in detain in the later part. Therefore, the title should be 睡眠与环境.