( )16. Why did the stream in Pinegrove Forest dry up?
B
( )17. Who said “Let’s follow the dry stream”?
B
( )18. What happened after they moved the tree?
B
( )19. What lesson did the animals learn?
C
( )20. What did the animals promise to do?
A
答案：B B B C A
情景問答
請看下面的情景提示：
海洋覆蓋了地球表面約71%的面積,并且生產(chǎn)了地球上約70%的氧氣。
(1)____
(2)____
答案：1.71%.
2.70%.
