【单选题】【消耗次数:1】
As pioneers, ( ) from around the globe are making deep-space journeys.
astronauts
astronomers
astrophysicist
astrologers
参考答案:
复制
纠错
相关题目
【单选题】 As man moves into the space age, the study of biological rhythms is of increasing____________ to travellers, pilots, the armed forces and astronauts.
①  importance
②  important
③  importantly
④  import
【单选题】 16. By using virtual reality programmes, it is possible to ____ deep into outer space without ever leaving Earth.
①  explore
②  find
③  escape
④  stay
【单选题】 James plans to __________ offers from other companies before making a decision.
①  explode
②  expand
③  expose
④  explore
【单选题】 It is from the earliest times ______ men have studied the world around them with interest.
①  which
②  where
③  how
④  that
【单选题】 ____ from space, our earth, with water covering 70% of its surface, appears as a “blue planet”.
①  Seeing
②  To be seen
③  Seen
④  Having seen
【单选题】 It was in 1969 ____ the American astronauts succeeded in landing on the moon.
①  when
②  the moment
③  which
④  that
【判断题】 The earth moves around the sun.
①  正确
②  错误
【单选题】 What are not good rules to follow for making instructions effective?
①  Use simple instructions and make them suit the comprehension level of the students
②  Use the mother tongue only when it is necessary
③  Use body language to assist understanding
④  Not model the task or activity before letting students move into groups or pairs .
【单选题】 Anger and bitterness had preyed upon me continually for weeks and a deep languor had succeeded this passionate struggle.
①  [A]几个星期来,气恼和痛苦不断地袭击着我;这种感情上的折磨后,我感到浑身无力。
②  [B]几个星期来,我处在气恼和痛苦之中;遭受这种感情的折磨后,我感到浑身无力。
③  [C] 几个星期来,我又气又恨,感到非常苦恼;经历了这种感情的折磨后,我感到浑身无力。
④  [D] 几个星期来,我经受着气恼和怨恨的吞噬;这种感情过后,我感到浑身无力。
【单选题】 The size of the generation gap seems to be spreading with ____ rapid changes in technology, in education, in transportation and in communication that are taking place all over ____ globe.
①  the;the
②  the;/
③  /;/
④  /;the
随机题目
【单选题】 平键联接的选择计算根据哪些因素进行键联接的强度校核( )
①  宽度
②  轴径
③  AB全部正确
【判断题】 销的基本形分为普通圆柱销和普通圆锥销,该说法( )
①  正确
②  错误
【单选题】 相同条件下包角越大,带的摩擦力和能传递的功率也( )
①  相同
②  越大
③  越小
【单选题】 滚子链传动大的主要失效形式( )
①  滚子、套筒的冲击疲劳破坏
②  链条铰链磨损
③  以上全部正确
④  链板疲劳破坏
【单选题】 在满足承载能力的条件下,高速重载时可选用小节距的( )
①  传动链
②  多排链
③  单排链
④  滚子流
【单选题】 齿轮的加工方法包括( )
①  冲压法
②  热轧法
③  以上全部正确
④  铸造法
【单选题】 齿轮传动的基本要求之一是其瞬时传动比保持变动。这必须使两轮齿廓曲线形状符合一定的条件,该说法( )
①  正确
②  错误
【单选题】 渐开线直齿圆柱齿轮的正确啮合条件是两轮的模数和( )必须分别相等
①  压力角
②  中心角
③  分度圆压力角
④  顶角
【单选题】 用范成法加工出的齿廓是刀具齿刃的共轭齿廓,被加工的齿轮与刀具的模数、压力角( )长度,故用同一把刀具可切制出各种齿数的齿轮,精度较高(可加工8级或8级以上精度的齿轮)
①  不等
②  相同
③  不同
【单选题】 锥齿轮传动用来传递两相交轴之间的回转运动和( )
①  摩擦力
②  阻力
③  动力
④  承载力