单项选择题

A．In cold zones.
B．In hot zones.
C．In temperate zones.
D．Any climate.
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单项选择题
A．Microwaves are strange electric waves.B．Microwaves travel in straight lines and do not follow the curve of the earth’’s surface.C．There are not any wires to send microwaves.D．We must amplify microwaves in relay stations.
A．Microwaves are strange electric waves.
B．Microwaves travel in straight lines and do not follow the curve of the earth’’s surface.
C．There are not any wires to send microwaves.
D．We must amplify microwaves in relay stations.
单项选择题
A．Quiet plants.B．Well-watered plantsC．Healthy plants.D．Thirsty plants.
A．Quiet plants.
B．Well-watered plants
C．Healthy plants.
D．Thirsty plants.
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