葛洲坝水利枢纽位于长江三峡出口，南津关下游2.3公里处，是三峡_爱下问搜题

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问题单项选择题

葛洲坝水利枢纽位于长江三峡出口，南津关下游2.3公里处，是三峡水利枢纽的航运梯级，对三峡水电站非恒定流进行反调节，是长江干流上兴建的第（）座大型水利枢纽。

A.1

B.2

C.3

D.4

答案

参考答案：A

选择题

若过点（0，-1）作抛物线y=ax²（a＞0）的两条切线互相垂直，则a为（　　）

完形填空

阅读下面短文，从短文后所给各题的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
When I was in the 8th grade in Ohio, a girl named Helen in my class had a terrible accident. As she was   31  to the bus in order not to miss it, she slipped on the ice and fell under the back wheels of the bus. She   32  the accident but was paralyzed from the waist down. I went to see her, in my 13-year-old   33  thinking that she wouldn’t live   34  from then on.
Over the years, I   35  and didn’t think much about Helen after that. Three years ago, in Florida, my oldest son was hit by a car while riding his bike,   36  a terrible brain injury. While I was looking after my son, a lady who said she was the hospital’s social worker called. It was a (an)   37  trying (难受的) day. I burst into tears for no reason and rang   38 .
A short time 1ater, a beautiful woman, in a wheelchair,   39  into my son’s room with a box of   40 . After 16 years, I still   41  Helen. She smiled, handed me the tissues and hugged me. I told her who I was, and after we both went through the shock of that, she began to tell me about   42  since we last saw each other. She married, had children and got her degree so that she   43  the path for those people who were less   44  than her. She told me that if there was anything she could give me, it would be   45 .
Looking at this wonderful, giving person, I felt   46 . But I also felt the first hope I had since learning that my son was   47 . From this person that I thought would have no   48  of life, I learned that where there is life, there is hope. My son miraculously (神奇的)   49  and we moved north, but I owe Helen   50  that I can never repay.

B．particularly

C．necessarily

D．hospitalized

B．some tissues