单项选择题
Before they left the factory, all the cars were carefully tested for（）
A.defects B.flaws C.faults D.errors
单项选择题 A 200-year-old building is very old in American（）
单项选择题 He who wants to succeed must（）difficulties and bitterness first.
单项选择题 The children（）at the sound of the terrorists' guns.
