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【单选题】
对于土壤风干样品的粗磨，在磨样室将风干的样品倒在有机玻璃板上，用敲打，用、木棒、有机玻璃棒再次压碎，拣出杂质，混匀，并用四分法取压碎样，过孔径（ ）尼龙筛。过筛后的样品全部置无色聚乙烯薄膜上，并充分搅拌混匀，再采用四分法取其两份，一份交样品库存放，另一份作样品的细磨用。粗磨样可直接用于土壤pH、阳离子交换量、元素有效态含量等项目的分析。A.
40目
B.
80目
C.
20目
D.
100目
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举一反三
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A.
unprepared
B.
unpreparedly
C.
not prepared it
D.
without preparing it
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【单选题】The author's major conclusion about mistakes in foreign language learning is that ______.
A.
mistakes are not important in the process of learning a language
B.
learners are often very afraid of making mistakes
C.
making mistakes can help the learner discover the rules
D.
native speakers often do not tell foreign language learners about their mistakes
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【单选题】Saving language should be the major concern of any small community whose language is under threat.
A.
YES
B.
NO
C.
NOT GIVEN
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