63. What is an ion according to the passage?
A. It’s a charged particle.
B. It’s basically static electricity indoors.
C. It’s a balance between the positive and negative charged.
D. It’s an ill effect on people’s physical and psychological health.
64. What effect does exceeding positive ionization have on most of the people?
A. They will throw up.
B. They will be sick and tired of life.
C. They may feel rather bad-tempered.
D. They may feel they are out of their mind.
65. A high negative ion count is likely to be found
.
A. in a mountainous area.
B. by a water spray in a garden.
C. close to a slow-flowing river.
D. near a pound with a water pump.
66. What is the author’s attitude towards the use of ionisers?
A. Neutral.
B. Opposed.
C. Supportive.
D. Ambiguous.
D
At the heart of the debate over illegal immigration lies one key question: are immigrants good or bad for the economy? The American public overwhelmingly thinks they're bad. Yet the consensus among most economists is that immigration, both legal and illegal, provides a small net boost to the economy. Immigrants provide cheap labor, lower the prices of everything from farm produce to new homes, and leave consumers with a little more money in their pockets. So why is there such a discrepancy between the perception of immigrants' impact on the economy and the reality?
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