单项选择题
For Web addresses, Chinese speakers now have to use （）.
A．pinyin B．signs C．numbers D．characters
单项选择题 Most doctors recognize that medicine is ______.
单项选择题 The civil war has ______ the country"s economic development by more than ten years.
单项选择题 I did not know what to do but then an idea suddenly ______ my mind.
