Task 1

16.Paragraph     ①     

17.Paragraph     ②          

18.Paragraph     ③      

19.Paragraph     ④           

20.Paragraph      ⑤      

A.Education

B.Land and Climate

C.State System

D.General Introduction

E.Economy

F.Population

The main purpose of the passage is to___________ 

• A、discuss the advantages and disadvantages of skyscrapers
  
  

• B、compare skyscrapers with other modern structures
  
  

• C、describe skyscrapers and their effect on the environment
  
  

• D、illustrate various architectural designs of skyscrapers
  
  

Holonyak's colleagues thought he would fail in his research on LEDs at the time when he started it.

• A、True
  
  

• B、False
  
  

• C、Not Given