听第二篇短文,回答第 16 — 20 小题。
(
B
)16. When was Thomas Edison born?
A. In 1837.
B. In 1847.
C. In 1857.
(
A
)17. How often did Edison make a new invention?
A. About every fourteen days.
B. About every seven days.
C. About once a month.
(
C
)18. Who taught Edison at home?
A. Himself.
B. His teacher.
C. His mother.
(
B
)19. Why are Edison's light bulbs (电灯泡) better than the old lamps (灯)?
A. Because they're much smaller.
B. Because they're much safer.
C. Because they're more beautiful.
(
C
)20. What made Edison successful?
A. The value of being lucky.
B. The drive to make money.
C. The spirit of never giving up.