B

Dolphins are one of the cleverest animals in the world. We may hear of many stories about how dolphins save people out of water.

Dolphins often eat fish and some other sea animals. A dolphin with a weight of 200kg to 250kg will eat 10kg to 25kg of fish every day. They like to swim with other dolphins and usually hunt in groups.

Dolphins have very good hearing. They use it to find things under the water. Many scientists also believe dolphins can even talk to each other through a special whistle (哨声).People from different areas don’t speak the same language. Just like people, dolphins’ whistles have many kinds. One day we may understand dolphins’ whistles, and then they will be able to tell us about themselves.

Dolphins live in the sea, but they are not a kind of fish and they don’t lay eggs. They have babies in the same way as cows and cats do, and give their babies milk. A female dolphin has a baby every two to three years.

Dolphins are very friendly. Sadly, there are not many kinds of dolphins left. People killed them for many years for food and other things. Now it’s time to stop this and perhaps there will be more of them in the years to come.

(    ) 66. If a dolphin weighs 240kg, how much of fish may it eat every day?

A. 5kg            B. 16kg             C. 30kg          D. 35kg

(    ) 67. How do dolphins find things under the water?

A. By taste.        B. By smell.         C. By hearing.     D. By touch.

(    ) 68. What can’t dolphins do according to this passage?

A. Save people out of water.     B. Talk to each other.

C. Give babies milk.           D. Lay eggs.

(    ) 69. Which of the following is right except______?

A. Dolphins are a kind of fish.   B. Dolphins eat fish and some other sea animals.

C. People may understand dolphins’ whistles some day.

D. Dolphins usually hunt in groups.

(    ) 70. Which is the best title for the passage?

A. What dolphins eat             B. Where dolphins live

C. How dolphins are swimming      D. Something about dolphins