题目

The audience were _____the performance of Chinese athletes at the 23rd Winter Olympics. A . impressed by B . impressed on C . interesting in D . expressed by 答案：A下面是有关果蝇的培养记录，通过本实验可以说明( )A. 果蝇的突变是通过影响酶的活性而引起的B. 果蝇的突变率与培养温度有关C. 果蝇在25 ℃时突变率最高D. 果蝇的突变率与培养地点所处的海拔高度有关