Americans gave nearly $300 billion away last year. Do you know the reason? Beyond the noble goals of helping others, it is that giving will make them happier.
It is a fact that givers are happier people than non-givers. According to the Social Capital Community Benchmark Survey, a survey of 30,000 American households, people who give money to charity are 43% more likely than non-givers to say they are “very happy” about their lives. Similarly, volunteers are 42% more likely to be very happy then non-volunteers.
The happiness difference between givers and non-givers is not due to differences in their personal characteristics, such as income or religion. Imagine two people who are identical in terms of income and faith, as well as age, education, politics, sex, and family circumstances, but one donates money and volunteers, while the other does not. The giver will be, on average, over 40 percentage points more likely to be very happy than the non-givers.
A number of studies have researched exactly why charity leads to happiness. The surprising conclusion is that giving affects our brain chemistry. For example, people who give often report feelings of euphoria, which psychologists have referred to as the “Helper’s High”. They believe that charitable activity produces a very mild version of the sensations people get from drugs like morphine and heroin.
Of course, not only does giving increase our happiness, but also our happiness increases the possibility that we will give. Everyone prefers to give more when they are happy. Researchers have investigated this by conducting experiments in which people are asked about their happiness before and after they participate in a charitable activity, such as volunteering to help children or serving meals to the poor. The result is clear that giving has a strong, positive causal impact on our happiness, so does happiness on giving
According to Paragraph 2. We can learn that         .

A．only those people who gave money to charity will be happy

B．more givers say they feel having happy lives than non-givers

C．those who donate money are happier than those who volunteer

D．42% of the volunteers say they are as happy as the non-volunteers

What causes the happiness difference?

A．Income.	B．Faith.
C．Education.	D．Donation.

The underlined word “euphoria” in Paragraph 4 is closest in meaning to         .

A．relaxation	B．uncertainty
C．nervousness	D．pleasure

If a person feels happy, he may         .

A．ask for more donations

B．stop charitable activity

C．be likely to give more

D．cook food for the poor

Which of the following is the main theme of this passage?

A．Giving brings happiness.

B．Americans love donating.

C．The happiness difference.

D．Feelings of volunteers.