题型分类:插入句子题
题干分析:分析待入位句子寻找线索词指代关系this migration,判定本题考查句间逻辑关系。
选项分析:
eventually reach the surface对应第四个框前文Both oil and gas are less dense than water, tend to rise upward;因此选D。
A框前文出现convert the organic matter to oil and gas;
B框前文顺接出现the gas and small droplets of oil…move into sandy layers nearby;
C框前文出现accumulations of gas and oil can collect in the sandy layers;
连续三个句子内容紧密衔接,因此可以排除前三个方框;不能再插入没有明显相关的信息。
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