题目

 Allen had to call a taxi because the box was _______ to carry all the way home. A. much too heavy               B. too much heavy C. heavy too much               D. too heavy much 答案：A19．现有100个氨基酸，其中共有氨基102个、羧基107个，则由它们合成的2条肽链中肽键、氨基、羧基的个数分别是（　　）A．98、4、9B．98、1、1C．100、4、9D．98、102、107