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　　46. _A_ the calculation is right scientistscan never be sure that they have included all variables and modeled themaccurately. [variable n. 变项，变量；model vt. 建模]
　　A Even if B As far as C If only D So long as
　　even if 即使，即便； so long as （后面加句子时）只要。
　　47. My train arrives in New York at eighto'clock tonight. The plane I would like to take from there _B_ by then.
　　A would leave B will have left C has left D had left
　　将来完成时：willhave + 动词过去分词。
　　49. Harry was _A_ by a bee when he wascollecting the honey.
　　A stung B stuck C bitten D scratched
　　sting v. （蜜蜂）叮，蛰； bite v. （蚊子等）咬； scratch vt. 抓伤，划破（通常指猫抓人）。
　　once bitten, twice shy. 一朝被蛇咬，十年怕井绳。
　　50. The thief tried to open the locked doorbut _B_.
　　A in no way B in vain C without effect D at a loss
　　in vain 徒劳，白费工夫； But很少与介词without联用； at a loss 不知所措。
　　52. _B_ seeing the damage he had done, thechild felt ashamed.
　　A By B On C At D For
　　on后面加动词ing形式表示“在…之后”这个时间概念。
　　54. Research findings show we spend abouttwo hours dreaming every night, no matter what we _C_ during the day.
　　A should have done B would have done C may have done D must have done
　　should have + 动词过去分词，表示本应该做； may have + 动词过去分词，表示可能做过；
　　与过去事实相反的虚拟语气主句谓语动词的表达形式可能用到：would have + 动词过去分词。
　　must have + 动词过去分词，表示对过去行为进行肯定推测。表示一定做过；
　　can't have + 动词过去分词，表示对过去行为进行否定推测，表示不可能做过。
　　56. This crop does not do well in soils[各种土壤] _B_ the one for which it hasbeen specially developed.
　　A outside B other than C beyond D rather than
　　outside prep. 在…外边； rather than 而不是（肯定前者，否定后者）。
　　beyond prep. 超出…的范围； beyondhis wildest dreams 超出他狂野的梦想。
　　other than 不同于，而非，当它与否定词no或not出现在同一个句子中时表示“除…之外”。
　　66. In no country _A_ Britain, it has beensaid, can on experience four seasons in the course of a single day.
　　A other than B more than C better than D rather than
　　63. My father seemed to be in no _A_ tolook at my school report.
　　A mood B emotion C attitude D feeling
　　be in no mood to do/doing sth. 没有情绪（心情）做什么事情。
　　67. I'm sorry I can't see you immediately;but if you'd like to take a seat, I'll be with you _B_. [in a moment 马上，立即（它作为时间状语时一定与将来时态搭配）= in aninstant.]
　　A for a moment B in a moment C for the moment D at the moment
　　68. The trumpet player was certainly loud.But I wasn't bothered by his loudness _D_ by his lack of talent. [trumpet 小号]
　　A than B more than C as D so much as
　　当否定词not与so much as出现在同一句子中时，它们的含义是：与其说…不如说…
　　70. Our journey was slow because the trainstopped _D_ at different villages.
　　A unceasingly B gradually C continuously D continually
　　unceasingly adv. 不停止地，不休止地； gradually adv. 逐渐地，逐步地；= step by step.
　　continuously adv. 连续不断地； continually adv. 时断时续地。