Read the following passage and choose the best answers each of the questions. Nylon was invented in the early 1930s by an American chemist, Julian Hi

Read the following passage and choose the best answers each of the questions.
Nylon was invented in the early 1930s by an American chemist, Julian Hill. Other scientists worked with his invention and finally on 27 October 1938, Nylon was introduced to the world. It was cheap and strong and immediately became successful, especially in the making of ladies’ stocking.
Today, nylon is found in many things: carpets, ropes, seat belts, furniture, computers, and even spare parts of the human body. It has played an important part : in our lives for over 50 years.
1.What is the main idea of the passage
A The history of Nylon
B The development of Nylon
C Why people use Nylon
D a.b are correct
2 When was Nylon invented
A in the late 1930s
B during 1930s
c in the early 1930 s
D 1930s
3What does the word ”introduce” in line 2 mean?
A tell somebody your name
B tell somebody the name of a person
C Bring something new into use for the first time
D bring something somewhere