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  3. Space Shuttle Project is one of the first huge-typed spaceflight instruments used for many times in the world, organized by Amer

Space Shuttle Project is one of the first huge-typed spaceflight instruments used for many times in the world, organized by Amer

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问题    Space Shuttle Project is one of the first huge-typed spaceflight instruments used for many times in the world, organized by American National Aviation and Spaceflight Bureau, the main researches of【C1】______are researching and making the system of space shuttle, suggesting and choosing【C2】______and landing ports, deciding the scheme of reclaiming the roll booster of solid rocket,【C3】______the establishment of repairing the roll booster, and rebuilding and expanding the building of the【C4】______and controlling system.
   At the beginning of 1969, the United States set up a group that specially researched the development direction of spaceflight with【C5】______for the next stage,【C6】______by deputy president. After【C7】______and research, it suggested that an aerocraft with great benefits in【C8】______should be made, eg【C9】______the spaceflight being its leading stanchion. In this project, five orbit implements were prescribed to be made,【C10】______"Exploitation", "Columbia", "Challenger", "Discovery" and "Atlands".
   In 1970, spaceflight got into an all-round【C11】______of research and manufacture. The whole-project had to delay more than three years. Five orbit implements were【C12】______to be four and flight experiment for six times was also decreased for four,【C13】______the number of production was cut down, according to the original scheme. In April 1971 this【C14】______was decided that Kennedy Space Centre was used for the launching and landing port for space shuttles, and Edwards Air Base was used for the【C15】______landing port. In February 1977, "Exploitation" Orbit Implement started to have entering and landing experiments in Edwards Air Base. From May 12, 1981 to July 4, 1982, "Columbia" Space Shuttle successfully finished four flight experiments for research and manufacture,【C16】______meant that the【C17】______and manufactures were over in【C18】______form.
   It【C19】______about2 years and cost more than 75 billion US dollars to finish the whole project. On November 11, 1990, space shuttles began to fly for【C20】______.
【C13】
选项 A、as
B、if
C、though
D、once
答案A
解析 本题考查点是主从句之间的语意关系知识。本句空白处前后的两个部分是主句和从句的关系。空白处后面“the number of production was cut down(生产数量削减)”应该是空白处前面“…flight experiment for six times was also decreased for four(飞行试验由六次减到四次)”的原因状语。故本题应该选用A(as由于)，以便表达本句的因果关系。“as”是多义词，比较难以理解和准确使用。
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