Belowthetopsoiloftheearthisthesubsoil,

问题详情：

Below the topsoil of the earth is the subsoil, ________layer that contains stones mixed with a small amount of________organic matter.

A. a; the　　　　　　                                     B. the; the

C. 不填； 不填                                            D. a; 不填

【回答】

 D

知识点：冠词

题型：选择题