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
From this article, we may draw the conclusion that _____.
A．The focus on the bird is an important yet missing characteristic, and without it even the successful discovery will seem hollow.
B．It is not the bird but the human efforts that attract a lot of readers' attention.
C．The article argues that the book is with great content and great focus.
D．Although the book is not stylish, readers still find interesting things in its characterization and extended hist0ry of the bird.
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.
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