题目内容：

    Some researchers explain how most people form their social groups with people of their age. Especially, as children and teenagers， even adults， people make their friends based on proximity （邻近） more than anything else． Even in a college classroom，the students may not make friends with those who have similar personalities and interests． It's the people they really sit next to．Clearly，who stands to you has the greatest influence on you．As Jim Rohn has widely said． "You are average （平均） of five people you spend the most time with．"

Over the past ten months， I've paid Ryan， it Famous writer of several bestselling books， to help with the book I'm writing． Working with him has shown me just how low my standards for my work are． For example， every time I send him a drab （草稿）， he shows me how it could be 10 times better，and he holds me to that standard．

It's because that I don't know what I don't know． Working with Ryan has made me realize what is possible and what it takes to create something powerful．

Like Ryan，my business partner Richard has wonderful ideas and far different experience than I have．He has written 36 New York Times Bestsellers．He's been speaking and doing events for 20 years．Richard always performs at high levels，and he is also very strict with me because my performance is a reflection （反映） on him． It's not a bad thing because it creates high pressure （压力） to help me make great progress in organizing author training．

In a word，you need to stay with those people who can help you realize your level and potential．Staying with people who have higher standards is the fastest way for you to change．If you don't change your environment， your progress will be very slow． Who you stay with has huge importance． You can't ignore this．

1.Why did the writer quote （引用） Jim Rohn's words in Paragraph 1？

A.To support the writer's opinion． B.To introduce the writer's best friend．

C.To show Jim Rohn's working ability． D.To prove Jim Rohn is a great person．

2.Which of the following can be put at the beginning of Paragraph 3？

A.It's not that my workmates' abilities are low．

B.It's not that my working ability was born low．

C.It's not that' e friends based on proximity．

D.It's not that I've paid Ryan to help me with my book．

3.What does the underlined word "it" in Paragraph 4 refer to （指代）？

A.The writer's performance． B.Jim Rohn's famous saying．

C.Richard's different experience． D.Richard's strictness with the writer．

4.The writer mainly wants to tell us that　   　．

A.we can improve our working abilities by ourselves

B.we must pay attention to our talent and potential

C.we'd better make friends with those who can hold us to higher levels

D.we should stay with those who have similar personalities and interests