A one-year-old baby boy plays outside. He walks away from his mother. His mother does not know about this. The boy comes to a bus. He boards (上车) it.

    People see that the baby is alone (独自的). They call the police. The passengers (乘客) take care of the baby. Police come. They find the mother an hour later.

1.How old is the boy?

A 4.

B 3.

C 2.

D 1.

解析：选D。D 细节理解题。根据“A one-year-old baby boy plays outside.”可知，该男孩一岁。故选D。

2.The boy comes to _______________.

A a bus

B a bike

C a car

D a plane

解析：选A。A 细节理解题。根据“The boy comes to a bus.”可知，男孩来到一辆公共汽车上。故选A。

3.People call ______________ when they see the boy.

A 120

B 110

C 119

D 122

解析：选B。B 细节理解题。根据“People see that the baby is alone. They call the police.”可知，人们看到婴儿独自一人，他们报了警。故选B。

4.Do the police find the boy’s mother?

A No, they aren’t.

B Yes, they are.

C Yes, they do.

D No, they don’t.

解析：选C。C细节理解题。根据“They find the mother an hour later.”可知，男孩的妈妈最后被找到了。故选C。