_陕西成考网

In which place is smiling at strangers considered impolite?

• A、 Asia.

• B、Russia.

• C、The U.S.

• D、Latin America.

What does the text mainly discuss about the Internet?

• A、Its influence on school teachers.

• B、Its effect on high school students.

• C、Its success in high school teaching.

• D、Its achievements in school research.

55.________.