To control weather over large areas of the world wonldseem,at this time,to be impossible．However,man has beenhighly 1 in his attempt to change the weather on a very 2 scale（规模）．He has 3 microclimate inside andoutside homes and offices．
Micro means small,and microclimate 4 the climateconditions over a small area．There are many things that might 5 the climate in a small area to be different from the 6 climate of the region where it is located．
7 ,within cities there might be smaller areas wherethe climate is different．The microclimate in the yard of one home may be 8 different from the one in the yard acrossthe street．It is the 9 of trees and their position in a yardthat 10 the microclimate．One could probably name many 11 things that would change the microclimate of a yard．High-altitude（高空的）flying and 12 development in spaceflight present situations which 13 complete control of microclimates．Before 14 planes can fly in the air of the stratosphere（同温层）,the cabins（机舱）have to be pressurized． 15 passengers can obtain the necessary oxygen．
In space 16 ,there is no air．Astronauts have to take their air with them． 17 have been developed in which this air can be 18 used over and over．In space,astronauts also have to be 19 from harmful radiation．The chief problem to be solved 20 man can exist in space is that of providing a microclimate in which he can survive．
My husband Val and I had not been getting along well lately．We didn’t argue, but we hardly 1 ．I knew that one 2 was that I often scold him．Unfortunately, I looked only at his faults and forgot to notice how 3 he had done in everything．
I really didn’t want to be 4 talking too much, but it almost seemed as if I could not 5 ．However, I made up my mind to 6 ．Could I?
I decided to try．Each day I would find one thing I liked in 7 and mentioned it to him．The first day, again, appeared the greatest problem．I noticed 8 things I didn’t like about Val．Why did he leave his books everywhere in his study instead of putting them 9 ?How could he wear that 10 shirt again?And I had a difficult time 11 with anything good I could mention．
I thought and thought． 12 he was good sometimes．When something needed repair around the house, Val 13 until he discovered what was wrong．
14 , I told Val I was glad he was patient with my faults and said 15 about the way I often scold him．He smiled a small, weak smile that made me 16 ,“Maybe this isn’t going to work．”I said to myself．But as three weeks continued, finding something good about my husband came 17 ．He deals honestly with everyone; he treats our children with 18 ．Why had I seen so many unpleasant things?
By the end of the 21 days, I couldn’t believe how easy 19 had become to praise Val．And Val did seem 20 ．In fact, he mentioned that I seemed to have changed a lot．