单项选择题

A、
B、
C、
D、

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单项选择题

半直接照明吊灯，它的中心光源较亮、光照向下，照明范围大，光线柔和。还有此类半间接照明的吊灯，光线往天花板打，反射照亮整个空间。

A．对
B．错

单项选择题

9. What should people do when signs of serious memory loss show up?
A、Check the brain’s cognitive reserve.
B、Turn to a professional for assistance.
C、Stop medications affecting memory.
D、Exercise to improve their well-being.