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．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.
单项选择题
A．On how to give presents to others on Christmas.B．On how to spend time with grandparents.C．On how to play hide-and-seek.D．On how to celebrate Christmas.
A．On how to give presents to others on Christmas.
B．On how to spend time with grandparents.
C．On how to play hide-and-seek.
D．On how to celebrate Christmas.
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