分类：教育/科学-外语学习-英语考试
问题：英语语法问题1,a,/,a,the请写出判断依据 
 ,a        ,/       ,a         ,the

请写出判断依据
回答：C  1)全句意思为"锻炼能使心肺跳动得更快"(直译:体育锻炼能使心肺以更高的速度跳动)  2) "以更高的速度""按更高的价钱"的英文表达是固定的,即at a higher rate .这里的higher是比较级,实际上句子中隐含的了被比较的对象,即心肺在身体未进行锻炼前的跳动速度,全句的意思实际上是  "体育锻炼能使心肺跳动得(比锻炼前)更快" For example:  1  Quantities in excess of twenty - five kilos are charged    at a higher rate.      重量超过２５公斤的要按更高的价格收取费用。  2  However, during the latter postvibration storage period, spermine content decreased while putrescine accumulated and ethyrene produced ----at a higher rate----- compared with the control fruit, showing that vibrational stress ultimately accelerated the overall senescence process of Chinese bayberry fruit.     而在振动胁迫后的贮藏后期，果实的精胺含量降低，腐胺积累较多，乙烯产生量较高，表明振动胁迫最终促进果实的全面衰老。 3 City kids went to school at a higher rate than their rural cousins.     都市小孩上学读书的比例比乡下表亲高多了。