学习这篇阅读理解对我来说有点理解上面的困难，在写题的过程中，有很多不认识的词语需要借助翻译软件去查询。这篇文章讲了关于心里学方面的知识，有很多的专业词汇是我不知道的，所以还需要在以后的学习过程中去积累一些有关于各个学科方面的专业词汇。

In this lesson, we learned and did a reading exercise. The reading comprehension is about whether graffiti is an art or a crime. It tells how in the past, people liked to scribble in public, but now the government has banned it. At the time of writing this reading, I have a lot of things I don't understand, and some words I don't know yet, so I need to look them up.

4. a. 200 and 400 million years

b. 10 million years

c. CH4

d. 70

e.  350 F

f. 700 F

g. 1112 F

h. over 900 F

a. D

b. E

c. F

d. B

e. G

f. C

g. A