B. quickly

　　C. privately

　　D. quietly

　　49. A. age

　　B. speed

　　C. distance

　　D. school

　　50. A. worry

　　B. hesitate

　　C. think

　　D. quarrel

　　51. A. singing

　　B. working

　　C. bargaining

　　D. learning

　　52. A. if

　　B. and

　　C. but

　　D. before

　　53. A. tiresome

　　B. hard

　　C. interesting

　　D. easy

　　54. A. blamed

　　B. amazed

　　C. interrupted

　　D. informed

　　55. A. their

　　B. his

　　C. our

　　D, your

　　工作；讨价还价，均不符合语境。

　　习一门新的语言从来都不容易（easy）。其余三项分别意为：令人厌烦的；困难的，努力的，坚硬的；有趣的，均不符合题意。

　　阅读下列短文, 从给的四个选项 (A、B、C和D) 中, 选出最佳选项。

　　(2017·辽宁，C)

　　Here is an astonishing and significant fact: Mental work alone can't make us tired. It sounds absurd. But a few years ago, scientists tried to find out how long the human brain could labor without reaching a stage of fatigue(疲劳). To the amazement of these scientists, they discovered that blood passing through the brain, when it is active, shows no fatigue at all! If we took a drop of blood from a day laborer, we could find it full of fatigue toxins(霉素) and fatigue products. But if we took blood from the brain of an Albert Einstein, it would show no fatigue toxins at the end of the day.

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