英语周报答案hnx2021-2022

19.(1)关系：暗穴早于陷穴。（1分)原因：黄土质地疏松，受潜蚀作用形成平行于地面的暗穴，后因重力作用，导致上覆土体塌陷，形成陷穴。(4分)(2)同：均位于坡面；沟缘明显。(2分)异：勺沟位于坡面中上部，上宽下窄，呈宽浅V型；(2分)切沟位于坡面中下部，上窄下宽，呈尖V型。(2分)(3)勺状沟壑形成于黄土潜蚀的坡面，(2分)后受到重力侵蚀和流水侵蚀的共同作用，尤其是沟头的溯源侵蚀促进了勺沟向上游发育；(2分)沟尾因（下渗或暗穴)流水减少，下蚀、侧蚀减弱，沟身变窄，直至消失。(2分)

第一节参考范文:Good morning, everyone! It is a great honour to have the chance to share my views on Body languageBody language is of great importance when it comes to communicating with others On various occasions, itconveys more than the words we speak. Accordingly, proper body language assists us to leave a good impressionon othersAs for me, I prefer to smile when communicating with someone. A smile can narrow the distance betweenus. It goes without saying that it is much easier for us to make approaches to the people with a smile. Besides,asmile makes our communication joyfuuIbody language is significant in communication, but we should use it in a proper wayThat's all. Thanks for your listening

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