Exercise 7 Answers
1.Energy conservation has become extremely important because millions of energy-consuming devices are in use every day.--->Complex
2.When builders construct new homes,they should install solar panels and other passive solar devices and as many energy-saving appliances as possible.--->Complex
3.Although energy-efficient appliances cost more,their use results in long-term savings for the owner,and the environment benefits,too.--->Compound-Complex
4.Because legislators have enacted certain laws,all new cars must be energy efficient.--->Complex
5.When cars use less gas,the air is cleaner,and people may have less trouble breathing.--->Compound-Complex
6.Though sulfur pollition is a threat to human health,it also damages lakes,wildlife and buildings.--->Complex
7.Although water power can generate electricity,hydroelectric dams may cause floods on farmlands,in forests,and in wildlife areas.--->Complex
8.We must always find ways of producing more goods,but at the same time we must reduce the amount of energy that we consume in producing those goods.--->Compound-Complex
9.Conservation and solar power are the keys to a safe future,so we must cautiously use the devices that cool,heat,and transport us.--->Complex
10.Because our natural resources clearly cannot last forever,we must find better ways of conserving them.--->Complex
