B
This is the word "family" written in Chinese "家". It's a pictographic character. The "宀" looks like the roof of a house, and the "豕" is a pictographic character for "pig", which is developed from a picture like this:

This word "家" with a pig under the roof of a house may show the importance of domestic animals to traditional Chinese families.
There is a strong feeling between parents, children and other family members. The father is usually very strict with the children. Parents work very hard to set a good example for their children while children study hard. Brothers and sisters in the family are very friendly and helpful to each other. All the family members make an effort to live a happy life.
Our ancestors will be part of our life and a warm memory forever. They bring all the family members close together. We remember our ancestors, not for anything good for ourselves but to make our feelings more active. Whenever we think of them, they make us stronger inside.
Everyone keeps the idea of "making all the members of the family happy". We should all have this same idea as the great "Chinese Dream". There are thousands of families in China. Just because every family goes well, China is getting better and better.
4. Why do parents work very hard according to the passage?
A. To get a strong feeling.
B. To set an example for their children.
C. To be strict with children.
D. To be friendly and helpful.
5. Which of the following is TRUE?
A. The word "家" shows the importance of wild animals.
B. Making all the family members happy is just a dream.
C. We remember our ancestors for something good for ourselves.
D. Our ancestors put all the family members together.
6. What do the underlined words "make an effort" mean?
A. Try their best. B. Work out. C. Try out. D. Feel free.
7. The passage is mainly showing us the importance of.
A. Chinese Dream B. a happy family
C. our ancestors D. warm memories

4. B
5. D
6. A
7. B

4. 根据文章第二段"Parents work very hard to set a good example for their children while children study hard."可知，父母努力工作是为了给孩子树立榜样，对应选项B。
5. 逐一分析选项：
A. 文章提到"家"体现的是家畜（domestic animals）对传统中国家庭的重要性，而非野生动物，A错误；
B. 文章最后表明让所有家庭成员幸福是大家秉持的理念，且和"中国梦"契合，并非只是梦想，B错误；
C. 根据第三段"We remember our ancestors, not for anything good for ourselves"可知，纪念祖先不是为了自己的利益，C错误；
D. 第三段"They bring all the family members close together."表明祖先让家庭成员紧密相连，D正确。
6. "make an effort"结合语境"All the family members make an effort to live a happy life."，意思是"尽最大努力"，和选项A"Try their best"意思一致。
7. 文章从汉字"家"的含义入手，讲述家庭中成员的相处、祖先的意义，最后强调让家庭成员幸福的理念，以及家庭和睦对国家的重要性，核心是展现幸福家庭的重要性，对应选项B。