单项选择题

A．Rain water dissolves materials as it comes down a base of limestone or shale.
B．People put dissolved materials into the soft water.
C．People treated hard water with special medicine.
D．Rainwater mixed with seawater.
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单项选择题
A．The Arctic coast.B．The west coast.C．The east coast.D．The central plain
A．The Arctic coast.
B．The west coast.
C．The east coast.
D．The central plain
单项选择题
A．She was greeted warmly by the large audience.B．She met a lot of old friends.C．She felt excited to find she knew everyone there.D．She felt quite sad that ,she was a stranger there.
A．She was greeted warmly by the large audience.
B．She met a lot of old friends.
C．She felt excited to find she knew everyone there.
D．She felt quite sad that ,she was a stranger there.
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