A、Droughts and Floods
B、Meteorologists
C、Changing Climate
D、Solar Heat
E、The rain
F、The wind
A、Droughts and Floods
B、Meteorologists
C、Changing Climate
D、Solar Heat
E、The rain
F、The wind
A.examine the chemical elements in the Ice Age
B.look into the pattern of solar wind activity
C.analyze the pattern of solar wind activity
D.find out the origin of carbon-14 on earth
What will happen when there is more solar wind activity?
A.Less carbon-14 is produced.
B.More carbon-14 is produced.
C.None carbon-14 is produced.
D.Nothing will happen.
A、Wind energy
B、Fossil fuels
C、Solar energy
D、Geothermal energy
A.altitude
B.alternate
C.alternating
D.alternative
What do we learn from the passage about solar wind activity?
A.It affects the growth of trees.
B.It has been increasing since the Ice Age.
C.It is determined by the chemicals in the air.
D.It follows a certain cycle.
A、Coal and oil
B、Solar energy
C、Wood and charcoal
D、Water and wind
A.undetermined
B.insignificant
C.unusual
D.indisputable
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