为了帮助考生能够更好的备考英语四六级，下面由留学群小编为你精心准备了“2020上半年青海英语四六级考试延期时间【公告】”，持续关注本站将可以持续获取更多的考试资讯！
2020上半年青海英语四六级考试延期时间【公告】
公告原文：
根据党中央、国务院关于新冠肺炎疫情防控工作的有关精神，经研究决定，原定于2020年6月13日举行的全国大学英语四、六级考试延期并分两次举行，考试日期分别为7月11日和9月19日。各高校可以根据复学复课实际情况及当地卫生防疫要求向省级考试机构提出考试申请，经批准后，组织一次或者两次考试。同一考生同一级别只能选择参加一次考试。具体报名时间以各省级考试机构公布为准。
2020年大学英语四级阅读练习：地层
The Earth comprises three principal layers: the dense, iron-rich core, the mantle made of silicate (硅酸盐) that are semi-molten at depth, and the thin, solid-surface crust There are two kinds of crust, a lower and denser oceanic crust and an upper，lighter continental crust found over only about 40 percent of the Earth's surface. The rocks of the crust are of very different ages. Some continental rocks are over 3,000 million years old, while those of the ocean floor are less than 200 million years old. The crusts and the top, solid part of the mantle, totaling about 70 to 100 kilometers in thickness, at present appear to consist of about 15 rigid plates, 7 of which are very large. These plates move over the semi-molten lower mantleto produce all of the major topographical(地形学的)features of the Earth. Active zones where intense deformation occur are confined to the narrow, interconnecting bo...