单项选择题

A．Be on time.
B．Take a small gift.
C．Smile and be friendly.
D．Take some flowers.
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单项选择题
A．Ten-month frost.B．Modification.C．Humidity.D．No summer.
A．Ten-month frost.
B．Modification.
C．Humidity.
D．No summer.
单项选择题
A．Rainwater 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.
A．Rainwater 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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