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

Senator Stennis was ______ when he was shot.

A．going to work
B．coming home from work
C．going out for the evening
D．coming home from a party

单项选择题

The doctor in Singapore performed a valuable service by ______.

A．finding the subgroup of the virus
B．developing a cure
C．keeping his patients apart from others
D．reporting the outbreak to W. H. O.