5．C　根据空后的“Regulations for these new businesses are unclear.”可知，还有一些关于这些新业务的规则还不清楚，这是一个问题，故选C。

　　三、语法填空

　　(2016·江西九江统考)

　　I was in trouble in overcoming my addiction to alcohol, and __1__ was my friend Mike. We never met each other until we came __2__ in the same treatment facility. Then we __3__ (be) out of the treatment center and returned to our life. Finally we became inseparable friends like brothers.

　　There was never a time __4__ I called him and he did not call me right back within a couple of __5__ (hour). We valued every chance we have to keep __6__ (we) both on the right track.

　　One day, I called Mike but he wasn't in. As usual, I had to leave a message, fully __7__ (expect) to hear from him later that evening or the next day. But I had not heard from him for nearly two days, and I became very __8__ (anxiety). On the third day, I received a message from Mike's wife that Mike had been killed in __9__ unexplained truck crash on the morning of my call.

　　I attended my friend's funeral, and even though I could __10__ (hard) walk, I helped carry my friend to his final resting place. Mike is still here, in my heart and my soul.

　　答案与解析　

　　语篇解读　作者在戒酒中心与Mike相遇、相知并成为朋友。后来Mike在一场事故中去世了，但他将永远活在作者的心里。

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