单项选择题

Why did the captain's "night writing" excite Braille

A．It used dots and dashes instead of letters.
B．It used sounds instead of letters.
C．It could be read by touch instead of sight.
D．It could he read at night.

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单项选择题

How did Braille make use of raised dots in his code

A．He used them for the 26 letters of the alphabet.
B．He used them for pictures.
C．He used them for punctuation marks and short words.
D．Both A and C.

单项选择题

Why weren't the teacher's books good enough for Louis

A．The words were so hard.
B．The words took up so much space.
C．It took so long to read a book.
D．It was difficult to read.