My brother          with his friends tomorrow if it          .            [ ]

A. is going to hike; won't rain            

B. is going hiking; doesn't rain            

C. will go hiking; won't rain            

D. goes hiking; doesn't rain

蚊香生产者为了节约原料和用户使用方便，要根据蚊香的然烧速度生产规格的各种蚊香，有一种蚊香如图所示，请你设计一个实验，测出该蚊香正常燃烧速度，要求：

（1）写出所需要的器材；

（2）说明测量方法。