【单选题】The old man began to learn to drive a car at the age of _____. [ ]
【判断题】钢在淬火后所获得马氏体组织的硬度主要取决于 马氏体中含碳量 。
【判断题】每一次大危机都会催生一些新技术.新技术是促进社会经济走出危机的推动力。 答案
【单选题】听力原文: More than sixty percent of all homes in the United States have at least one thing in common: the people living in them keep one or more small animals as pets. These pet owners spend about ten bi...
A.
They keep one or more small animals at home as pets.
B.
They kill animals from time to time.
C.
They let animals run or fly away now and then.
D.
They exchange their animals year in and year out.
【判断题】At least sixty children died from the products and almost 300,000 others became sick.