单项选择题

A．Clean.
B．Powerful.
C．Cheap.
D．Secure.
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单项选择题
A．Only half the world’’s water can be used.B．The world population is increasing faster and faster.C．Half of the world’’s water resources have been seriously polluted.D．Humanity has not placed sufficient value on water resources.
A．Only half the world’’s water can be used.
B．The world population is increasing faster and faster.
C．Half of the world’’s water resources have been seriously polluted.
D．Humanity has not placed sufficient value on water resources.
单项选择题
A．Early American Indians never ate roast corns.B．Early American Indians planted lots of varieties of corns.C．Corn was important for early American Indians.D．Early American Indians ate corns fresh from the field.
A．Early American Indians never ate roast corns.
B．Early American Indians planted lots of varieties of corns.
C．Corn was important for early American Indians.
D．Early American Indians ate corns fresh from the field.
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