1.1. Where is the boy?

A In Beijing.　

B In Jinan.

C In Chongqing.

D

解析：选C。C细节理解题。根据原文“A boy is on a trip in Chongqing.”可知男孩在重庆旅行。故选C。

2.2. What does the cart do?

A It goes back.　

B It is very heavy.

C It is very high.

D

解析：选A。A 细节理解题。根据原文“Look! The cart goes back.”可知，手推车在坡上往后溜了。选项B“It is very heavy”是文章第一段对车的静态描述，但题目问的是“车在做什么”；选项C“It is very high”描述的是山坡（“The hill is very high.”），与手推车无关。故选A。

3.3. What does the boy’s mom say?

A Go back.　

B Help others.

C Be happy.

D

解析：选B。B细节理解题。根据原文“His mom says, ‘Always help others!’”可知，妈妈对男孩说“要永远帮助别人”。故选B。

4.4. What can we learn from the boy?

A Help others when we can.　

B Go on trips often.　

C Always look at the sky.

D

解析：选A。A 推理判断题。文中男孩看到老人的车往后退，立刻“runs to help the old man”，妈妈也教导他“Always help others!”，由此可以推断，我们应该像男孩一样乐于助人。选项B“Go on trips often”只是文章开头的背景信息（on a trip），不是要学的道理；选项C“Always look at the sky”在文中没有出处。故选A。