One day, a monkey rides(骑) his bike near the river. There’s a tiger under a tree. The tiger runs(跑) at him. He is afraid and falls into the river. He can’t swim. He shouts. The rabbit(兔) hears him. He jumps into the river. The rabbit swims to the monkey,but he can’t help him. An elephant comes along. He is very strong. He helps the rabbit and monkey. Three friends are very happy. They go to the elephant’s home and have a big meal. Then, three of them become good friends. 

1.One day, a monkey rides his bike ______.

A in the park

B near the river

C under the tree

D in the street

解析：选B。B 细节理解题。根据文章第一句“One day, a monkey rides his bike near the river.”可知，一天，一只猴子在河边骑他的自行车。故选B。

2.The monkey sees ______ under the tree.

A a rabbit

B a cat

C a tiger

D a dog

解析：选C。C 细节理解题。根据文章第二句的“There’s a tiger under a tree.”可知，树下有一只老虎。故选C。

3. ______ falls into the river.

A A monkey

B A rabbit

C A panda

D A pig

解析：选A。A 细节理解题。根据文章第四句的“He is afraid and falls into the river.”可知，他（猴子）害怕并且掉进了河里。故选A。

4.The elephant is _________.

A angry

B afraid

C hungry

D strong

解析：选D。D 细节理解题。根据文章倒数第五句的“He is very strong.”可知，大象很强壮。故选D。

5.______ of them become good friends.

A Two

B Three

C Four

D Five

解析：选B。B 细节理解题。根据文章最后一句的“Then, three of them become good friends.”可知，然后，他们三个成为了好朋友。故选B。