練習：

　　1. What is Alvin?

　　A A research institute.

　　B A transporting vehicle.

　　C A submersible.

　　D A scientist.

　　2. Which of the following statements is NOT a fact about Alvin?

　　A h can carry explorers as deep as 6，500 meters.

　　B It has played a key role in various important undersea expeditions

　　C It was launched in the sixties of the twentieth century.

　　D It has been used for more than 40 years.

　　3. “...a world that is still full of mysteries” refers to

　　A the earth.

　　B out space.

　　C the ocean.

　　D Mars.

　　4. In what aspects are the new HOV and Alvin similar?

　　A Size.

　　B Speed.

　　C Capacity.

　　D Shape.

　　5. In what aspects are the new HOV and Alvin different?

　　A Offering better views.

　　B Speed.

　　C Size.

　　D Both A and B.