六级练习2013.05.31
[audio]http://sound.yywz123.com/tingbbs/cet6/cet620130531.mp3[/audio]Do you know that vegetables can be grown in climates they are not accustomed to?(1)___________________________________________.In Hawaii, engineers have been able to actually make those vegetables live in cooler climates.That way they grow faster and taste better.What these engineers have been using is cold seawater.The temperature of seawater is much lower than the air temperature.How do they use it? They place pipes in the soil and the cold water flowing through them cools the earth.(2)___________________________________.Also, some of these pipes are exposed to the air and they make the moistureform little water drops and thus irrigate the gardens.What is especially appealing about this process is that nothing damaging to the natural environment is being used.Another innovative use for cold ocean water is to cool buildings.Engineers believe that, for example,the entire west coast of the United States could be air-conditioned using seawater.We all know there are certain types of chemicals used in air conditioner,which not only pollutes the air but also bring damage to the ozone.(3)____________________________________________________.
**** Hidden Message ***** cool climate vegetables are now to be grown in places as hot as Hawaii
this stimulate plant growth and enables gardeners in * climates to grow crops from cooler climates.
if we could cool the city by using seawater, the environment of the whole city will be improved and the ozone will be protected which will be beneficial to ourselves in return. ~
页:
[1]