It is called solar cooker, a newly designed cooking device and there are many kinds o

It is an advantage of using the solar energy that it won’t create any pollution.（英译中)

The need for solar electricity is clear. It is safe, ecologically sound, efficient, contin

When is it cheaper to make an international call？A．12a. m.B．6p. m.C．11p. m.

The U.S. is called a "melting pot" becauseA．its steel industry is highly developed.B．it ha

It is well known that teaching is a job _____ enough patience.A. calling on

It is well known that teaching is a job enough patience. A. calling on B. callin