2018年学位英语考试自测习题及答案（20）_第5页

　　Part Ⅳ Cloze Test (10 points)

　　Directions:There are 10 blanks in the following passage. For each numbered blank, there are 4 choices marked A, B, C and D. Choose the best one and mark your answer on the ANSWER SHEET with a single line through the centre.

　　Perhaps more than anything else, scientists are eager to find out if Martian life existed in the past—or still exists. ___76___ telescopes first zoomed in ___77___ Mars in the 17th century, people have conjured up a wild ___78___ of images or what Martians might look like. But space probes like the 1997 Sojourner land rover have yielded no evidence of such alien beings.

　　Most experts agree that if life did at one time evolve on Mars, finding evidence of that life—which would likely take the form of tiny organisms—won’t be easy. ___79___, many scientists are optimistic. “We’ve got organisms on Earth that adapted to life deep ___80___ the surface in underground water wells, ”says Stephen Clifford. “___81___ life like that evolved on Mars four billion years ago, there’s no reason why it ___82___ today.”

　　___83___ last year’s disappointing losses, the future of Martian exploration looks ___84___. This year, two major films about fictitious Mars missions—Red Planet and Missions to Mars—are certain to heighten interest in our planetary neighbour. More important, plans for new sets of NASA orbiters and landers—one to launch in 2001, the other in 2003—are already in the works. Without a doubt, each new mission will inch scientists closer to ___85___ the mysteries of planet Mars.

　　76. A. When B. Before C. Ever since D. Ever

　　77. A. in B. on C. in the D. on the

　　78. A. varying B. various C. plenty D. variety

　　79. A. Still B. Even if C. Though D. Although

　　80. A. up B. under C. below D. above

　　81. A. When B. What C. That D. If

　　82. A. wouldn’t exist B. wouldn’t have existed

　　C. doesn’t exist D. has existed

　　83. A. Even if B. Despite C. Although D. However

　　84. A. promised B. being promised

　　C. promising D. to be promised

　　85. A. understand B. understanding

　　C. be understood D. the understanding

　　Part Ⅴ Writing (15 points)

　　Directions:Now more people enjoy buying lottery tickets. Study the following charts carefully and write an article on the topic of Lottery. In your article, you should cover the following points:

　　(1)describe the graph.

　　(2)analyze the reasons which account for the phenomenon.

　　(3)give your comments on it.