5. Alvin can go up and down at a rate of 30 meters every second, and its maximum speed is 2 knots , while the new vehicle will be able to ascend (上升)and descend at 44 meters per second. Itll reach speeds of 3 knots, or 3.5 miles per hour.

　　Alvin: 世界上第一个深海潜水器，它最有名的深海探测包括1986年对泰坦尼克号残骸的测量工作。

　　练习：

　　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) It 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.

　　题目详解：

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