阅读理解。

     Birds don't need lessons in building nests. Fish don't need coaching to learn how to swim. All animals

have instincts. They're born with natural abilities to do certain things. Wild animals also learn by copying

their parents and practicing. And pets learn through training.

     But instincts and training aren't the only keys to animals' behavior. Scientists say animals' thoughts and

feelings also influence their actions. Animals often make choices, plans, and sensible changes. They can

help others and solve problems. Some even make and use tools!

     If animals could talk, what would they say about their thoughts and feelings? A gorilla (大猩猩) born

in captivity (关在笼子里) has helped answer that question. Koko, a gorilla, was taught to use sign language

(手势语). She has learned hundreds of words!

     Koko once had a pet cat she named All Ball. "Koko love Ball," she signed. "Soft good cat." One time,

she blamed the cat for biting her by signing "You bad dirty toilet!" When her pet died, Koko cried. "Sad for

sleeping cat," she signed.

     Koko calls herself "fine animal gorilla". She uses sign language to argue, joke, and ask and answer

questions.

     "Most animals can't use words to tell us their thoughts," says Dr. Jonathan Balcombe. "But Koko shows

us that animals have their own ideas and feelings." Dr. Balcombe is a scientist at the Humane Society of the

United States. He says there's even more to discover about animals through field studies. In field studies,

people watch animals in their natural environment.

     "Scientists who study animals' natural behaviors learn how animals live and think," Balcombe says. "That

knowledge can help others respect every animal who shares the planet with us."

1. The underlined word "instincts" in the first paragraph probably refers to the ability that _____. [ ]

A. animals copy their parents

B. animals learn by practicing

C. animals are born with

D. animals learn through training

2. The example of Koko shows that _____. [ ]

A. an animal likes to have its own pet

B. an animal can learn to speak through training

C. an animal has the natural ability to speak

D. an animal can speak its mind

3. According to Balcombe, learning how animals live and think can _____. [ ]

A. help people care for animals

B. teach animals to use words

C. train animals to use tools

D. train animals to be cleverer

4. What might be the best title for the passage? [ ]

A. Raising animals as pets

B. Understanding animals

C. Training animals to speak

D. Protecting animals from danger