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技巧一： 前后照应
包括题号： 1--challenges，10--newspaper，14--different，15--math，18—try，16--trouble
（09 陕西） “ Take a bite of each one. See if that helps you decide which one is which.” He took ________, and then a huge smile came across his face.big bites            B. deep breaths  C. a firm hold        D. a close look
答案为： A 依据前面一句话 “take a bite of each one”可得知这里是他咬了几口。