听第二篇短文，回答第 16 至 20 小题。
(
A
) 16. What is the purpose of the online courses?
A. To help learn about American culture.
B. To help make friends with local people.
C. To help learn how to travel online.
(
B
) 17. How long does the course last?
A. For four days.
B. For about a month.
C. For four months.
(
B
) 18. How can you be a guest in an American family in Los Angeles?
A. By clicking on the “choice” icon.
B. By clicking on the “family” icon.
C. By sending some emails.
(
A
) 19. What does Jack think of the online teachers?
A. Helpful and patient.
B. Kind and experienced.
C. Hard - working and nice.
(
A
) 20. What CAN'T you do by choosing different icons?
A. Visit Hollywood or the Gold Gate Bridge.
B. Go shopping.
C. Choose small or large groups to join.
