单项选择题


Questions 27 and 28 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions.
Now, listen to the news.
Why were two rail companies fined

A.Because they asked young students to work at night.
B.Because their train was not safe.
C.Because they hired college students illegally.
D.Because their work practice system was unsafe.