（1）An ice cream easily

on the road on a hot summer day.
A.goes bad
B.gets smelly
C.disappears
（2）Solar energy is the energy that comes from

.
A.the sun
B.the moon
C.the water.
（3）Solar energy can be used to heat houses，water plants and to

.
A.produce cookers
B.produce electricity
C.do housework
（4）Why are the solar cookers great？
A.It is difficult to get them.
B.You needn't pay any money，and produce no pollution.
C.They save money and energy，and produce no pollution.
（5）How many houses take advantage of solar energy in the USA？
A.Over 2，000，000
B.Over 200，000.
C.Less than 200，000.