生物性废弃物包括（）。A．传染性生物因子的废弃样本培养基 B．废弃的实验动物及接触实

用不等式表示下列关系

①亮亮的年龄（记为x）不到14岁．______

②七年级（1）班的男生数（记为y）不超过30人．______

③某饮料中果汁的含量（记为x）不低于20%．______．

五年级一班47个同学合影，价格是第一次付8.5元给5张相片，另外加印是每张0.68元．全班每人各要一张，一共需要付多少元？（得数保留一位小数）

除去下列物质中的少量杂质，所用试剂及方法正确的是

Spending as little as $5 a day on someone else could significantly boost happiness, the team at the University of British Columbia and Harvard Business School found on Thursday.

Their experiments on more than 630 Americans showed they were measurably happier when they spent money on others—even if they thought spending the money on themselves would make them happier.

“We wanted to test our theory that how people spend their money is at least as important as how much money they earn,” said Elizabeth Dunn, a psychologist at the University of British Columbia. They asked their 600 volunteers first to rate their general happiness, report their annual (yearly) income and detail their monthly spending including bills, gifts for themselves, girls for others and donations to charity.

“Regardless of how much income each person made, those who spent money on others reported greater happiness, while those who spent more on themselves did not,” Dunn said in a statement.

Dunn’s team also surveyed 16 employees at a company in Boston before and after they received an annual profit-sharing bonus of between $3,000 and $8,000. “Employees who devoted more of their bonus to pro-social spending experienced greater happiness after receiving the bonus and the manner in which they spent that bonus was a more important predictor of their happiness than the size of the bonus itself” they wrote in their report, published in the journal Science.

　　They gave their volunteers $5 or $20 and half got clear instructions on how to spend it. Those who spent the money on someone or something else reported feeling happier about it.

“These findings suggest that very minor alterations (changes) in spending allocations (shares)—as little as $5—may be enough to produce real gains in happiness on a given day，”Dunn said.

60. What is the general idea of the passage?

A. The more you earn, the greater happiness you will get.

B. Spending more money on yourself will make you happier.

C. Money can buy happiness, but only if you spend it on someone else.

D. You can spend only 5$ a day to get happiness.

61. The underlined word “boost” in the first paragraph probably means_______.

A. help to find     B. help to bring    C. help to increase     D. help to get

62. Which of the following statements is NOT true according to the passage?

A. Those who spend more money on others can get much more bonus.

B. People usually think spending money on themselves will make them happier.

C. Very small changes in spending your money may be enough to gain happiness.

D. Researchers think that how people spend their money is at least as important as how much money they earn.

63. It can be inferred from the 6th paragraph that ______.

A. the volunteers not given 5$ or 20$ spent their own money on themselves.

B. those who spent the money on someone or something else felt happier about it.

C. the volunteers were given 5$ or 20$ as a reward for the experiment.

D. half of the volunteers could spend the money as they liked.

简述清校勘专著。