单项选择题

A．Wavy lines.
B．Circular lines.
C．Perpendicular lines.
D．Parallel lines.
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单项选择题
A．They should be prepared for the possible rain. B．It will rain much later in the week. C．They need to buy another umbrella. D．The weather forecast is often unreliable.
A．They should be prepared for the possible rain.
B．It will rain much later in the week.
C．They need to buy another umbrella.
D．The weather forecast is often unreliable.
单项选择题
A．Their summer addresses. B．Any damage to their rooms. C．When they plan to leave. D．Questions for the housing office.
A．Their summer addresses.
B．Any damage to their rooms.
C．When they plan to leave.
D．Questions for the housing office.
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