疏忽误差一般什么情况下产生的？
参考答案：
看错刻度，写错数据，选错单位或算错数字
______ volcanoes for many years, I am still amazed at their beauty as well as their potential
to cause great damage. [ ]
A. Studied
B. Having studied
C. Studying
D. To have been studied
何谓去大脑强直？机制是什么？
