Gus is a 6-year-old pet dog. He is fighting with cancer(癌症). He’s now receiving chemotherapy(接受化疗) at a hospital and recently had to have one of his legs amputated(截肢).

On Sunday, Gus took off into a cold river. Gus’ owner, Cleo Young, said her grandkids Ella and Lucy watched him from shore(岸) swim far out. It was looking like he was looking for something under the water.

When he emerged from the water, he was not alone. “First time swimming with three legs, he comes out of the water with a baby otter(水獭) in his mouth!” said Ella.

The little cold otter was covered in sand, so they washed it with water from the river and carried it to the Wildlife Rehabilitation Center(野生动物康复中心). The team there took good care of the otter. It became healthy again. They said if Gus hadn’t saved it, it would have died. “It was a Sunday we will remember for a long time,” Ella said

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1.Gus lost one of his legs because of _______.

A a fight with other dogs

B a traffic accident

C a sports meet

D his illness

解析：选D。D细节理解题。根据第一段可知，狗狗格斯因患癌症接受化疗，不得不被截肢一条腿。故选D。

2.What can we learn from Paragraph 2?

A Gus likes swimming very much.

B The weather was bad that Sunday.

C Ella and Lucy went swimming with Gus.

D Something in the river drew Gus’s attention.

解析：选D。D推理判断题。根据第二段可知，格斯从岸边游到很远的地方，似乎在寻找水下面的什么东西，由此推断水中的东西引起了格斯的注意。故选D。

3.What does the underlined word “emerged” probably mean?

A Went under.

B Lost the way.

C Showed up.

D Died of.

解析：选C。C词义猜测题。根据下文“he comes out of the water with a baby otter in his mouth”可知，格斯嘴里叼着一只小水獭从水里出来，由此猜测emerge意为“出现(show up)”。go under表示“下沉”；lose the way表示“迷路”；die of表示“死于……”。故选C。

4.What did Ella and her family do for the baby otter?

A They took it home.

B They gave it some food.

C They looked for its mother.

D They took it to an animal center.

解析：选D。D细节理解题。根据最后一段第一句“Covered in sand, they washed him with water from the river and carried him to the Wildlife Rehabilitation Center.”可知，他们为小水獭冲澡，然后把它带到了野生动物康复中心去。故选D。

5.What’s the main idea of the passage?

A Gus is our friend.

B Cancer is not so terrible.

C We all should learn how to swim.

D A disabled dog saves an otter from river.

解析：选D。D主旨大意题。通读全文可知，文章讲述了一只只有三条腿的狗游到河里救出一只小水獭的故事。故选D。