题目

Doctors are always giving suggestions. For example, they suggest that people pay attention to keeping bugs ( 虫子) from getting into _____________ ears, especially in warm places, like Guangdong Province. But some never pay_____________ attention.Last month, Mr Lv, aged 24, felt something wrong with his right ear. He felt a great pain in his ear, and felt like something was running in his ear. _________________the young man went to the hospital. He asked Dr Zhong to _______________the pain.Dr Zhong, an ear—nose—and—throat (ENT) doctor at the hospital,_____________ his ear and found a f下列物质中，分子里的所有原子不可能在同一平面上的是                      A．乙炔   B．苯甲醛   C．异戊二烯  D．丙烯醛（CH2=CH―CHO）