题干

读我国局部地区的水系示意图,新中国成立后,在黄河干流上建设的三门峡水庠大坝,对渭河造成巨大的影响。关于对渭河影响叙述正确的是    (  )

A:大大减少了渭河流域的水、旱灾害

B:渭河水位抬升,流速减缓

C:泥沙淤积减少,利于通航

D:流速加快,白净能力增强

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答案(点此获取答案解析)

B

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    Hiking with some friends provided an opportunity to relax ourselves. Cold with a mixture of sun and snow1a quicker step on the mountain. On the way, we2a large troop of boy scouts and their families heading down as well. The majority of the troop was quickly well ahead and out of3.

    Left behind were a boy and his mother who seemed uneasy. We slowed our4to talk with them before we 5passed them. They caught up again when my friend 6to tie her shoe. The boy at that moment fell down. My friend attempted to 7him as he rolled down the path.

    Helped up, the boy was8, crying in his mother's arms. He said that his knee hurt and I could see the9spreading across the mother's face. I asked if I could help, with my friend explaining that I was a nurse. After a quick 10 I could tell that more than anything he was 11,his mom as well.12he stayed sitting, wrapped in his non's arms. Asking if they needed anything before we continued on, I turned to go leaving the13sitting on a rock.

    I only took a few steps forward before14 that there was more that could be done .I15 to my friends for slowing them down, then turned and asked the boy and his mother if they wanted me to wait and hike down with them when they were 16.I could see the relief wash over the mother's face as she said “yes” and17stood to continue on.

    The New England autumn had left the path 18with beautiful slippery leaves. So we went slowly, ensuring19footsteps. I realized that I was being gifted with more time to take in the20of the woods, conversation with friends and connections.