题目

根据短文内容，从方框中选择适当的词并用其正确形式填空，使短文完整、正确。（每个词只能用一次）有两个多余词。 hand  thirsty  letter  mistake  hurry   umbrella  it  polite    she    if  sorry  hungry Allen studied in a city far from her hometown．One day，she went to buy a blue umbrella for her mother as a birthday present，because   （1） was old and broken． On her way back to school，Allen felt   （2）  and went into a tea house for a drink．There were so many people in it．She found a seat and sat at a table欲使0.1 mol·L-1的NaHCO3溶液中c(H+)、c()、c()都减少，其方法是 A.通入二氧化碳气体子                     B.加入氢氧化钠固体C.通入氯化氢气体                           D.加入饱和石灰水溶液