【简答题】The air bag is a piece of safety equipment in cars. It was first designed by John W. Hetrick in 1952. Like many inventions, he came up with the idea as a result of an that had occurred in his li...
【简答题】用所给词的适当形式填空。 1. Jim came to China several years ago. Now he can _____ (sing) Beijing Opera very well. 2. He likes _____ (play) the trumpet. 3. Would you like _____ (join) our art club? 4. I need some ...