B．Sleep is important for everyone.

　　C．This is why staying in bed for longer than usual might confuse our body clock.

　　D．But delays of up to two hours or more can throw our body out of order.

　　E．I need more sleep!

　　F．However, if we sleep longer, our sleep becomes less efficient.

　　G．Our body keeps a clock inside.

　　答案：1～5　EAGCD

　　课时练(三)　第Ⅱ卷强化增分练(练规范)

　　(限时：45分钟)

　　Ⅰ.语法填空

　　(2016·大庆市高三第二次质检)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 for about a year 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 she said Mike had been killed in __9__ unexplained truck crash on the morning of my call.

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