A． building bridges across them
B． driving generators into them
C． building dams across them
D． directing them into homes and factories
[单选题]Passage FiveF．rom the beginning rivers have played an important part in the life of man. Man of the earliest times used the rivers as a means of traveling. Today rivers still serve as a great waterway for the transport and people.In ancient times, ma
[单选题]The thins brought down by rivers from the mountains that are useful for cultivation are______.A． deltasB． cropsC． fresh water lifeD． soil and minerals
Heat energy（）from the sun in a direct way is the most widely used energy today.A
[单选题]The best oliveoil is obtained from olives that are [harvested] just after t
[单选题]The best oliveoil is obtained from olives that are [harvested] just after t
As the name implies solar is the energy from the suns rays . The amount of energ
[单选题]We can use energy from the sun because ______.
[单选题]The best olive oilis obtained from olives that are [harvested ]just after t
5 We should move away from traditional energy sources, and begin to____cleaner f
One very（ ）serious problem is energy. We get a great （ ） of energy we need from