Part IV  Cloze  (10 minutes, 10 points, 0.5 for each )

　　Directions: In this part, there is a passage with twenty blanks. For each blank there are four choices marked A, B, C and D. Choose the best answer for each blank and mark the corresponding letter on your ANSWER SHEET with a single line through the center.

　　In recent years a new farming revolution has begun, one that involves the 61 of life at a fundamental level - the gene. The study of genetics has 62 a new industry called biotechnology. As the name suggest, it 63 biology and modem technology through such techniques as genetic engineering. Some of the new biotech companies specialize in

　　agriculture and are working feverishly to 64 seeds that give a high yield, that 65 diseases, drought and frost, and that reduce the need for 66 chemicals. If such goals could be achieved, it would be most 67. But some have raised concerns about genetically engineered crops.

　　In nature, genetic diversity is created within certain 68 .A rose can be crossed with a different kind of rose, but a rose will never cross with a potato. Genetic engineering, 69 usually involves taking genes from one species and inserting them into another 70 to transfer a desired characteristic. This could mean, for example, selecting a gene which leads to the production of a chemical with anti-freeze 71 from an artic fish, and inserting it into a potato or strawberry to make it frost-resistant. 72, then, biotechnology allows humans to 73 the genetic walls that separate species.

　　Like the green revolution, 74 some call the gene revolution contributes to the problem of genetic uniformity---some say even more so 75 geneticists can employ techniques such as cloning and 76 culture(培养), processes that produce perfectly 77 copies. Concerns about the erosion of biodiversity, therefore, remain. Genetically altered plants, however, raise new 78, such as the effects that they may have on us and the environment. “We are flying blindly into a new 79 of agricultural biotechnology with high hopes, few constraints, and little idea of the potential 80,” said science writer Jeremy Rifkin.

　　61. A. manipulation       B. management        C. manufacture        D. maturity

　　62. A. got along with      B. given rise to        C. come up with        D. lived up to

　　63. A. broods            B. breeds             C. blends             D.  blasts

　　64. A. hatch             B. train               C. duplicate           D. patent

　　65. A. restrict            B. resist              C. reverse             D. retrieve

　　66. A. hostile            B. hydraulic           C. hazardous           D. harmless

　　67. A. beneficial          B. disappointing       C. surprising           D. extreme

　　68. A. lines              B. limits              C. space              D. ages

　　69. A. after all            B. on the other hand    C. in any case          D. as a rest

　　70. A. to the point        B. in no case           C. in an attempt     D. with regard

　　71. A. quality            B. property            C. priority         D. quantity

　　72. A. In essence         B. In part              C. In advance      D. In return

　　73. A. brake             B. blaze               C. breach         D. brand

　　74. A. what              B. as                 C. where          D. so

　　75. A. that               B. because             C. if             D. when

　　76. A. skin               B. tissue              C. organ          D. muscle

　　77. A. resembling          B. alike               C. similar         D. identical

　　78. A. issues              B. height              C. difficulties      D. goals

　　79. A. spot               B. era                 C. deadline        D. scheme

　　80. A. navigation          B. mystery             C. outcomes       D. destination

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