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试题详情及答案解析: Look! There are on the floor. Please pick them up.
A. two piece of papers
B. two pieces of paper
C. two pieces of paper; 答案：B; 试题分析：句意：看！地上有两张纸，请捡起来。paper纸，是不可数名词，没有复数形式；表示一张纸，用量词a piece of;两张纸是two pieces of paper，故选B。
考点：考查不可数名词。