So many thousands of terrified people died　　 there was an outbreak.

A every time B for the first time C every other time D at times

课文和新概念填空（共10题；每小题1分，共10分）

John Snow was a famous doctor in London - so   1   , indeed, that he   2    Queen Victoria as her personal physician. But he became inspired when he thought about helping ordinary people    3   to cholera. This was the   4    disease of its day. Neither its cause nor its cure was understood. So many thousands of terrified people died every time there was an outbreak. John Snow wanted to face the    5    and solve this problem. He knew that cholera would never be controlled until its cause was found.

At last firemen have put out a big forest fire in California. Since then, they have been trying to find out how the fire began. Forest fires are often caused by broken glass or by cigarette ends which people carelessly throw away. Yesterday the firemen    6    the ground carefully, but were not able to find any broken glass. They were also quite sure that a cigarette end did not start the fire. This morning, however, a fireman    7   discovered the cause. He noticed the    8   of a snake which was wound round the electric wires of a 16,000-volt power line. In this way, he was able to solve the mystery. The    9   was simple but very unusual. A bird had    10    the snake from the ground and then dropped it on to the wires. The snake then wound itself round the wires. When it did so, it sent sparks down to the ground and these immediately started a fire.