收费站每季度组织一次收费速度测试，每次抽测人数不少于（）。每半年将测试结果汇总报送公司。
参考答案：50%
把相应的大小写字母连起来。
_____ she is not so healthy _____ she used to be? [ ]
A. Why is it that; what
B. Why it is that; that
C. Why is it that; as
D. Why it is that; who
