课后练习:

1.“We’ve all gone a little ____ about the outer space business,” says Vice Admiral C.B. Momsen.

A craze B crazy C crazed D crazing

2.The ocean is the place where we should be putting our efforts in order to ____ future generations.

A provide for B provide with C provided that D provide

3.Seventy-one percent of the earth’s surface is covered ____ water.

A by B for C in D at

4.An observer, ____ the earth from another planet, would be likely to call it Oceanus.

A look at B looked at C looking at D is look at

5.One main branch of sea science, physical oceanography, _____ enormous unanswered questions.

A hold B to hold C holds D holding

6.We know that several depressions in the floor are ____ than Mt. Everest is high, but we can’t be sure that we have found the ______ one.

A deep, deep B deepest, deeper C deeper, deep D deeper, deepest

7.The world’s deepest land shaft accessible to men is the Champion Reef gold mine in India, _____ is only 9,811 feet deep.

A that B which C who D what

8.____ will take him years of the most painstaking instrument building, campaigns at sea, and every conceivable cross-check to establish the doubt.

A It B This C That D What

答案：1B 2A 3A 4C 5C 6D 7B 8A

补充练习：

1. Only if these negative results are valid formulate the question: how do they live.

A he will be able toB will he be able to

2. He instantly identified it as a coelacanth, a species for 60 million years.

A believed extinct B to believe extinctC has believed extinctD believe extinct

3． Serious scientists do not the possibility that there are sea monsters to be discovered.

A rule overB rule offC rule onD rule out

4. Consider the abyssal valley the Marianas Trench, west of Guam.

A calling; lyingB called; lyingC called; lain