Don't read in bed.为什么用in

Don't read in bed.为什么用in Don't read in bed. Don't read in bed any m_r_ 为什么“Don't read in bed.It's bad for your eyes.”这里用“in bed”而不用 don't read in bed 可以在read后面加一个a book吗?为什么 Don't read in bed ,for there in no _____ Don't read ( ).A.at bed B.in bed C.in the bed bed,don't,in,read.(连词成句) The mother told her son Don't read in bed Don't read in bed.这句话的汉语是什么? Don't sleep in the bed.为什么用sleep Don't read _ .A\ in the bed B\ in bed C \on the bed D\on bed