阅读下面短文，根据短文意义，按照语法结构和行文逻辑，在空白处填入适当的单词；或根据首字母提示写出该单词。

More and more middle school students in China are getting shorter sleeping time. Most students sleep f小题1:than nine hours every night, 小题2: they have much homework to do. Some homework is 小题3:by school teachers, and some by parents. Also, some students don’t know 小题4:to save the time. They are not careful e小题5: while doing their homework, so it takes them a lot of time. Some students have to get up early every morning on w 小题6:to get to school on time by bus or by bike. It can小题7:a long way from home to school. Teachers and parents should c 小题8:down some of the homework so that the children can

e 小题9:nine hours of sleep every night for their 小题10:.

利多卡因对哪种心律失常无效（）

A.心室颤动

B.室性期前收缩

C.室上性心动过速

D.强心苷引起的室性心律失常

E.心肌梗死所致的室性早搏