The old man looks pretty ( )

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The old man looks pretty ( )
A:health B:healthy C:healthier D:healthily
为什么选B 要语法理由和每个词应该怎么用

health是名词,意为“健康”｡ healthy是由名词health加后缀-y派生出来的同义形容词｡ healthy意为“健康的”､“强壮的”,其同义词为fit,相当于well或strong.其反义词是unhealthy或者weak.例如：
His health is not good.他的身体不好｡
Here’s to your health!
—How are you recently?你近来怎样?　　—Oh,I’m very healthy.哦,我很好｡
As he just left hospital,he is still not so healthy.(=As he just left hospital,he is still quite unhealthy.=As he just left hospital,he is still quite weak.) 因为刚刚出院,他的身体仍然相当虚弱｡
再问：还有其他的两个呢？还有为什么不能是looks health 而一定要是healthy?
再答： healthier healthy的比较级，意思是更健康 healthily 副词，健康地 looks pretty 后加形容词，所以用healthy

The old man looks pretty ( ) the old man looks pretty ___. The old man looks 10.—The old man looks healthy. The man looks o____sixth years old. the old man looks 什么(worry) the old man looks but he doesn't live The old man looks fat.怎样改一般疑问句? -The old man looks healthy.-Yes.He________ some running afte The old man looks ( ) about his poor son's illness. The man looks over forty years old 的同义句 The girl looks (so pretty).对文中带括号部分提问?It is an old sweater.(