Question

 阅读表达（共5小题；每小题3分，满分15分）

阅读下面短文并回答问题，然后将答案写到题后相应的位置上（请注意问题后的字数要求）。

As in the field of space travel,  so in the undersea exploration (探险), new technologies continue to appear.  They____________________with each other—as well as some important differences.

Manned submersibles (潜水器), like spaceships,  must maintain living conditions in an unnatural environment. But while a spaceship must simply be sealed（密封）against the vacuum (真空) of space,  a submersible must be able to bear extreme pressure if it is not to break up in deep water.

In exploring space,  unmanned vehicles were employed before astronauts,  in the undersea exploration,  on the other hand,  men paved the way,  and only recently have unmanned Remote Operated Vehicles (ROVs) been put to use.

One reason for this is that communicating with vehicles in orbit is much easier than talking to those underwater. A vacuum is an ideal medium for radio communications, but underwater, communications are limited to much slower sound waves. Thus, most undersea vehicles, particularly ROVs, operate at the end of long ropes.

For a similar reason,  knowing where you are undersea is much more difficult than in space.  A spaceship’s position can be located by following its radio signal,  or by using telescopes and radars. For an undersea vehicle,  however,  a special network of sonar(声纳) devices must be laid out in advance on the ocean floor in the area of a dive to locate the vehicle’s position.

Though undersea exploration is more challenging than outer space in a number of respects, it has a distinct advantage:  Going to the ocean depths doesn’t require the power necessary to escape Earth’s gravity. Thus it remains far less expensive.

76. What is the best title of this passage?  (no more than 10 words)

77. What do manned submersibles resemble spaceships in? (no more than 10 words)

78. What do you think of the undersea exploration?  Why?  (no more than 20 words)

79. Fill in the blank in the first paragraph with proper words. (no more than 10 words)

80. How many kinds of new technologies used in the undersea exploration are mentioned? Please list their names. (no more than 7 words)

Answer 1

76. The Differences between Undersea Exploration and Space Exploration／Undersea Exploration and Space Exploration

77. They both must maintain living conditions in an unnatural environment.

78. It is useful and important，because it has a lot of advantages and is much cheaper.

79. have a lot in common／share a number of similarities

80. Three:  manned submersibles; unmanned vehicles; sonar devices.