A

()16. Where are the pandas from?
A. China. B. South Africa. C. Australia. D. America.
()17. Mrs. Miller's daughter is 1.3 meters. Mrs. Miller needs to pay yuan if she took her daughter to the zoo.
A. 10 B. 20 C. 25 D. 30
()18. When can people go to the zoo?
A. At 8:30 a. m. on Wednesday. B. At 5:30 p. m. on Friday.
C. At 9:30 a. m. on Sunday. D. At 6:30 p. m. on Saturday.
()19. How many kinds of animals can you see in the zoo?
A. Three. B. Four. C. Five. D. Six.
()20. We can know that .
A. the African elephants can sing songs B. the giraffes come from Australia
C. we need to keep the zoo clean D. the beautiful birds come from Africa

16. A
17. B
18. C
19. C
20. C

16. 根据文中“Sichuan pandas can show ball games for you.”，四川是中国的省份，可知熊猫来自中国，故选A。
17. 根据票价信息：成人票20元，身高1.4米以下的儿童免费。Miller夫人是成人，女儿1.3米符合免费条件，因此只需支付20元，故选B。
18. 根据开放时间：周一至周五9:00 a.m.~5:00 p.m.，周末9:00 a.m.~6:00 p.m.。周日上午9:30在开放时段内，其余选项均不符合开放时间，故选C。
19. 文中提到的动物有非洲象、美洲鸟类、南非长颈鹿、澳大利亚考拉、四川熊猫，共5种，故选C。
20. 根据文末“Keep the zoo clean!”可知C选项正确；A选项是美洲鸟类会唱歌，并非非洲象；B选项长颈鹿来自南非，不是澳大利亚；D选项鸟类来自美洲，不是非洲，故选C。