Questions 19 to 21 are based on the passage you have just heard.
A.They believed in working for goals B.They enjoyed living a living a life of ease C.They had all kinds of entertainment D.They were known to be creative
单项选择题19题选().
A.It was when her ancestors came to America B.People had plenty of land to cultivate then C.It marked the beginning of something new D.Everything was natural and genuine then
单项选择题18题选().
A.They are extremely accurate C.They were first made in space B.They are expensive to make D.They were invented in the 1970s