英语四级考试完形填空的模拟练习题（47）

　　Mars is not, it seems, the dry old planet we once believed it to be. Astronauts who are __1__ to go there in the next decade may find plenty __2__ water to slake their thirst.

　　And with water present the __3__ of finding some sort of life on Mars are __4__ brighter.

　　This is the view of 40 __5__ all over the world who have been analyzing __6__ of pictures and other scientific __7__ obtained by robot explorers in the sixties and seventies.

　　To begin with scientists thought the Red Planet was as __8__ as the Moon with dust storms swirling over vast sandy __9__. But now the picture is very different with mountains and valleys carved by __10__ glaciers and torrential rivers rushing and rumbling deep underground.

　　In a report on the __11__ of the Martian pictures Dr. Michael Car of the US Geological Survey comments: I am __12__ theres lots of water on Mars. Any surface water will be in the __13__ of ice. But it could save explorers __14__ to take so much fresh __15__ with them.

　　The report says __16__ Mars probably had a warmer climate in ages __17__ due to its axis having been more steeply tilted towards the Sun.

　　__18__ convincing signs of plant or animal life have been __19__ by instruments soft landed on Mars, __20__ only the immediate vicinity of landing vehicles could be examined.

　　1. A) expected B) hoped C) required D) eager

　　2. A) to B) of C) more D) in

　　3. A) chances B) openings C) occasions D) opportunities

　　4. A) quite B) very C) much D) more

　　5. A) biologists B) geologists C) sociologists D) psychologists

　　6. A) lots B) quantities C) thousand D) thousands

　　7. A) tidings B) news C) intelligence D) information

　　8. A) peaceful B) quiet C) lifeless D) dead

　　9. A) deserts B) mountains C) seas D) rivers

　　10. A) energetic B) great C) massive D) mighty

　　11. A) diagnosis B) syntheses C) analysis D) analyses

　　12. A) convinced B) guaranteed C) believed D) proved

　　13. A) appearance B) mould C) form D) shape

　　14. A) taking B) having C) conveying D) carrying

　　15. A) water B) ice C) food D) vegetable

　　16. A) what B) if C) how D) that

　　17. A) pass B) past C) ago D) before

　　18. A) Not B) No C) Nor D) Never

　　19. A) detected B) touched C) seen D) felt

　　20. A) probably B) perhaps C) supposed D) although