问题 单项选择题

正常1岁小儿每分钟呼吸次数为

A.15~25次
B.20~25次
C.30~40次
D.45~50次
E.55~65次

答案

参考答案:C

解析: 1岁以内小儿每分钟呼吸次数为30~40。

探究题

       中国古代有“秀才不出门,便知天下事”的说法,今天这种说法已经通过计算机网络变成了现实。结合所学知识,回答下列问题:

(1)计算机网络是哪次科技革命的成果?

                                                                                                                                                         

(2)这次科技革命主要在哪些领域展开?

                                                                                                                                                         

(3)这次科技革命有何特点?

                                                                                                                                                         

(4)你怎样看待中学生上网?

                                                                                                                                                          

单项选择题 B1型题