单选题
The experiment with the photographs shows that_________.
A、
none of them are clever enough to communicate freely.
B、
early signs fail to communicate certain ideas.
C、
the youngsters are better at describing the photographs.
D、
the elders are better at locating the photographs.
【正确答案】
B
【答案解析】
[解析] 第三段第一句“Early users，too，did not develop a way of distinguishing left from right．”语意为“早期的手语者也不能区分左右”，证明某些左右的概念是早期手语者不能表达的。
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