Red wolves (红狼) live only in the USA. They are coming back now.

A zoo in Washington helps red wolves. The zoo cares for their teeth. Bad teeth make it hard for them to eat. There are only about 270 red wolves. Most of them are in zoos. Only 20 wolves live in the wild in North Carolina. The zoo’s vets (兽医) clean the wolves’ teeth and make sure they are healthy.

Wolves in the zoo live longer because they see the vet often. In the past, red wolves lived in many places. But now there are not many. People are working hard to protect them and put them back in the wild.

1.Where do red wolves live?

A In Thailand.

B In the UK.

C In China.

D In the USA.

解析：选D。D细节理解题。根据第一段第一句的“Red wolves live only in the USA.”可知，红狼只生活在美国。故选D。

2.The zoo in Washington helps care for red wolves’_________.

A ears

B eyes

C teeth

D legs

解析：选C。C细节理解题。根据第二段第二句的“The zoo cares for their teeth.”可知，动物园帮助红狼治疗它们的牙齿。故选C。

3.How many red wolves live in the wild in North Carolina?

A 10.

B 20.

C 200.

D 270.

解析：选B。B 细节理解题。根据第二段第六句“Only 20 wolves live in the wild in North Carolina.”可知，在北卡罗来纳州，只有20只红狼生活在野外。故选B。

4.Why do wolves in the zoo live longer?

A Because the zoo is clean.

B Because they wear warm clothes.

C Because they see vets more often.

D Because they eat healthy food.

解析：选C。C细节理解题。根据第三段第一句的“Wolves in the zoo live longer because they see the vet often.”可知，动物园里的红狼寿命更长，因为它们经常去看兽医。故选C。

5.What does the underlined word “them” refer to?

A Red wolves.

B Vets.

C Zoos.

D Animals.

解析：选A。A词意指代题。根据划线部分前两句“In the past, red wolves live in many places. But now there are not many.”可知，过去红狼生活在许多地方，但现在已经没有了，因此人们正在努力保护它们（红狼）。故选A。