Sequoyah had more free time than the other tribesmen because he was________.
A. developing an alphabet
B. a hunter
C. a very old man
D. crippled
The soldier ran from Marathon to Athens in a racing competition.
A. Right.
B. Wrong.
C. Doesn't say.
【B1】
A. every four years
B. every year
C. every four year
The Internet has a history of ______ years.
A. less than 30
B. about 40
C. about 20
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