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【单选题】上世纪五六十年代，中国科学家克服重重困难，先后研制出了“两弹一星”，在国内外产生了巨大而深远的影响，也打破了超级大国的核讹诈和核垄断，奠定了我国在国际事务中的重要地位，振奋了国威、军威，极大地鼓舞了中国人民的志气。“两弹一星”具体是指（ ）。
A.
原子弹、氢弹、实用通信卫星
B.
原子弹、氢弹、人造地球卫星
C.
原子弹、核弹、人造地球卫星
D.
导弹、氢弹、返回式卫星
【单选题】Businesses put lots of time and money into new plans, programs and excellent employees with the hope things will change．Yet, at the end of the effort, not much changes．What happens? In most cases, tho...
A.
What past experience is useful for businesses?
B.
How much time is needed for making plans?
C.
How can changes be made in businesses?
D.
What kinds of employees are the best?