【正文】
. 單項選擇 ( ) 1. Light bulb is widely people today. A. used by B. using by C. used of D. used to ( ) 2. his life, he made many contributions to the people. A. When B. With C. During D. Since ( ) 3. The old man is an , and he a lot of things all these years. A. invention。 invent B. inventor。 invent B. inventor。 has invented