题目

Monarch butterflies from eastern Canada make the most amazing journey in the insect world. Each year, this butterfly travels about 3000miles to its winter home in central Mexico(墨西哥). How can it fly so far? And why does it make this long and dangerous trip? Scientists still don’t have an answer.For many years, people in Mexico wondered where the orange-and-black butterflies came from every winter. Then, in 1937, a scientist started to follow and study the butterflies. For the next 20 years, he discovered that one butterfly started its journey in Canada. Four months later, it arrived in以下说法中正确的是A. 某同学走路上学的速度大约25m/sB. 光在水中传播的速度大约25m/sC. 高速路上汽车行驶的速度大约25m/sD. 高空中飞机飞行的速度大约25m/s