单项选择题

In the late 1950’s, for the first time a computer programming language _____.

A．began using binary numbers
B．was used to implement the Unix operating system
C．was put into the market
D．was used for modeling physical and environmental events

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单项选择题

By saying that the book of Grail Bird could easily be a book about the hunt for Bigfoot , the author means that _____.

A．the book is merely about the hunt for impossible things.
B．if the bird had not been discovered by the researchers, the book would have been like all the books about Bigfoot - only legends, no facts and truths.
C．the hunt for the ivory-billed woodpecker enjoys similarity to the hunt for Bigfoot, because both of them are rare animals.
D．the book is about the human obsession of finding legendary animals and about their guilty conscience facing nature.

单项选择题

Which programming language is designed for the instruction of youngsters

A．BASIC
B．FORTRAN
C．ALGOL
D．LOGO

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