Below the topsoil of the earth is the subsoil, _____ layer that contains stones mixed with a small amount of _____ organic matter.
A．a(chǎn); theB．the; theC．不填; 不填D．a(chǎn); 不填
D
考查冠詞。表示泛指用a/an；特指用the。句意“在表層土下面是下層土，下層土是一層含有一種帶有少量有機(jī)物質(zhì)的石頭的土層�！边@里泛指一個(gè)土層，用a；organic matter不可數(shù)，前不用冠詞。故選D。
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