When the great library of Alexandria burned, the story goes, one book was saved. But it was not a valuable book; and so a poor man, who could read a little, bought it for a few coppers（铜钱）.The book wasn’t very interesting, but between its pages there was something very interesting indeed. It was a thin strip（条）of vellum（牛皮纸）on which was written the secret of the “Touchstone”!
The touchstone was a small pebble（小园石）that could turn any common metal into pure gold. The writing explained that it was lying among thousands and thousands of other pebbles that looked exactly like it. But the secret was this: The real stone would feel warm, while ordinary pebbles are cold.
So the man sold his few belongings, bought some simple supplies, camped on the seashore, and began testing pebbles. He knew that if he picked up ordinary pebbles and threw them down again because they were cold, he might pick up the same pebble hundreds of times. So, when he felt one that was cold, he threw it into the sea. He spent a whole day doing this but none of them was the touchstone. Yet he went on and on this way. Pick up a pebble. Cold-throw it into the sea. Pick up another. Throw it into the sea.
The days stretched into weeks and the weeks into months. One day, however, about mid-afternoon, he picked up a pebble and it was warm. He threw it into the sea before he realized what he had done. He had formed such a strong habit of throwing each pebble into the sea that when the one he wanted came along, he still threw it away.
So it is with opportunity. Unless we are vigilant（警惕的）, it’s easy to fail to recognize an opportunity when it is in hand and it’s just as easy to throw it away.
The book was special to the man because ______.

A．it was made of vellum

B．it was the only book that survived the great fire

C．it was a story about how to tell the touchstone from ordinary stones

D．it included the secret of the touchstone

He threw pebbles into the sea ______.

A．to test how far he could throw

B．to practice throwing pebbles

C．to avoid picking up the same pebble once again

D．to express his disappointment at failing to find the touchstone

What message does the story want to convey?

A．Careful habits can lead to success.

B．Habits can benefit you but also hold you back.

C．Never judge a person or a thing by appearances.

D．Opportunity only visits the ready and watchful mind

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