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
According to the text, the ivory-billed woodpecker ______.
A．is extinct since the year of 1994
B．was found by a group of 17 researchers through the internet
C．is called "Grail Bird" because it is hallowed to the degree of holiness
D．is so famous that it has become a symbol of the spoiled relationship between human beings and nature
单项选择题
Which of the following statements is NOT true
A．Fielding Lewis has taken two pictures of the bird, but it was too fuzzy and he was mistakenly discredited.
B．The author believes that the woodpecker-whisperer do have a telepathic connection to the birds.
C．The quality of the book may not so perfect in itself, but there is still something to be cherished and reflected on.
D．There is much sweating, sitting and waiting before the completion of the book.
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