Have you ever heard the phrase "You never get a second chance to make a first impression （印象）？" It may sound like an unusual piece of advice，but it is true，the first impression someone has of you will probably influence how that person treats you in the future.
    What is even more interesting is that the brain creates first impression in about three seconds.When you meet someone for the first time，by the time you have introduced your name or shaken hands，the other person has already formed an opinion on you.
    So how do you make a good first impression？All things are very important，such as being polite，and being well-dressed.However，the most important is your face.Smiling and looking like you are happy will almost always leave a positive impression on people，especially those who do not know you.To be honest，most people are ready to smile back when they are smiled at.
   Besides，smiling and being positive helps you to know and get a better understanding of new things.This means that you can possibly be friendlier to people you don't know and be able to solve problems more quickly.So if you ever need a reason to be happy，think about the wonderful people you might meet and impress with a cheerful smile.
（1）The second paragraph is written to show that

D

D

.
A．how the brain works while meeting others
B．how to make a good first impression
C．how the first impression influences you
D．how soon others form opinions on you
（2）

C

C

is the most important to leave good impressions.
A．Shaking hands
B．Dressing nicely
C．Wearing a smile
D．Telling your name
（3）The underlined word "positive" probably means

B

B

.
A．消極的
B．積極的
C．贊成的
D．反對(duì)的
（4）The structure of the passage is

A

A

.
①Paragraph 1
②Paragraph 2
③Paragraph 3
④Paragraph 4
A． ①/②/③④
B． ①/②③/④
C． ①/②③④
D． ①②③/④