With the abundance of material, people’s thirst for spiritual culture has ____________ in quality. A: tripped B: tripled C: halved D: plummeted

Unfortunately he ___and fell over, tearing a hole in his trousersand grazing his knee. A: tripped. B: trip C: tripled D: stripped

The Purchase of Louisiana<br/>Territory in 1803 from France ______. A: increased the American<br/>territory by one third B: increased the American<br/>territory by a half C: almost doubled the size of<br/>the United States D: almost tripled the size of<br/>the United States

The number of people aged 60 years and over has tripled since 1950 globally, reaching 600 million in 2000 and surpassing ______ million in 2006. It is projected that the combined senior and geriatric population will reach 2.1 billion by 2050. A: 650 B: 700 C: 750 D: 800

Questions 1-6Choose the correct letter, A, B, C or D.Write the correct letter in boxes 1-6 on your answer sheet. Which is not true about the live music（） A: The sales of concert ticket tripled in America from 1999 to 2009. B: More people are going to concerts. C: The prices of concert tickets are rising. D: The prices of concert tickets are dropin