This passage is mainly about how to conduct a survey.（）

This passage talks mainly about ______.

A．when and how the umbrella was invented

B．why the umbrella was so popular in Europe

C．the development of the umbrella

D．the history and use of the umbrella

This passage talks mainly about ______ .

A．when and how the umbrella was invented

B．why the umbrella was so popular in Europe

C．the development of the umbrella

D．the history and use of the umbrella

What is the passage mainly about？

A) Dressing for effect.

B) How to dress appropriately.

C) Managerial positions and clothing.

D) Dressing for the occasion.

This passage talks mainly about ______ .

A．when and how the umbrella was invented

B．why the umbrella was so popular in Europe

C．the development of the umbrella

D．the history and use of the umbrella

This passage talks mainly about

A．why the umbrella was so popular in Europe

B．when and how the umbrella was invented

C．the history and the use of umbrella

D．the development of the umbrella

The passage is mainly about ______.

A．the causes for a disaster

B．African volcanic eruptions

C．how to tame a killer lake

D．discussion of how to protect the pastures in Africa

What is the passage mainly about？

A．An investigation into how Americans spend their vocations.

B．An opinion poll of how people should spend their leisure time.

C．A poll of how employed Americans spend their time,

D．A report on the vocation plans of college graduates in America.