阅读下面文章,回答以下问题Braille is not a language,but it can be used by

阅读下面文章,回答以下问题
Braille is not a language,but it can be used by the blind to read,write,do math and even write music.
Louis Braille,a Frenchman who became blind after a childhood accident,developed Braille in the 1820s.While attending an activity for the blind in Paris,Louis Braille learned that French soldiers used a special code that could be read without a light to send messages at night.Louis Braille was just 11 years old then,but he spent almost nine years using this code to create something that the blind could use to read with their fingers.Louis Braille's system is still used today.
Braille includes letters,symbols(符号) for numbers,musical notes and other things.To read Braille,people should move their index fingers(食指) from left to right along the symbols on each line of page.Experienced readers can read Braille books as quickly as people who can see.
Braille can be written on paper,too.Today,Braille is even used in computer programs.
1.Braille is_________.
A.a French soldier
B.a symbol for numbers
C.a musical note
D.an invention for the blind to read or write
2.Louis Braille finished the Braille system at_________years old.
A.9 B.11 C.20 D.26
3.Braille includes all of them except_______.
A.letters B.math C.numbers D.musical notes
4.What does the underlined.word "code" mean?
A.密码 B.形式 C.手段 D.技术
5.Which of the following is TRUE?
A.Louis Braille was blind when he was born.
B.It's not possible to read musical notes in Braille.
C.The Braille system allows the blind people to do math.
D.Users of Braille cannot read books as fast as sighted readers.