完形填空
Growing roots
When I was growing up, I had an old neighbor named Dr. Gibbs. He didn't look like any doctor I'd 1 known. When Dr. Gibbs wasn't 2 lives, he was planting trees.
The good doctor had some3 theories on planting trees. He believed in “No pains, no gains”. He never 4 his new trees, which was5 many people. Once I asked why. He 6 that watering plants spoiled them, and that if you water them, each following tree generation will 7 weaker and weaker. So you have to make things8 for them. He talked about how watering trees
9 shallow roots, and how trees that weren't watered had to grow deep roots in
10 of water. I came to understand that he meant deep roots were to be 11 I planted a couple of trees a few years back and I took good care of them. Two years of12 has resulted in trees that expect to be waited on hand and foot. Whenever a cold wind blows, they 13and tremble their branches. Funny things about those trees of Dr. Gibbs'. The lack of water seemed to 14them in ways comfort and ease never could.
I used to15for my sons that their lives will be easy. But16 I've been thinking that it's time to17 my prayer. I know my children are going to meet
18 and I'm praying they will be strong. The prayer for comfort is seldom met. What we need to do is to pray for deep roots,19when the winds blow, we won't be20away.
中的x和y，都扩大3倍，那么分式的值（ ）