问题
单项选择题
光敏电阻的主要作用是（）。
A.光电检测
B.红外探测
C.光电开头
D.光电探测与控制
答案
参考答案：D
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光敏电阻的主要作用是（）。
A.光电检测
B.红外探测
C.光电开头
D.光电探测与控制
参考答案：D
Alan is much heavier than he wants to be. He to get thinner. So he tries to eat and he eats very little sugar(糖) because it will make him . He also takes exercise every .He swims very often, he runs about five kilometers a day. Now he is than before. Alan’s sister Tara is than Alan. She is also younger and thinner than he is. She takes every day, too. She doesn’t much meat. But she eats a lot of fruit and vegetables because she thinks are better for her health.
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