Q: Read the following article and select the best answer. Article: Recent research has claimed that an excess of positive ions in the air can have an ill effect on people's physical or psychological health. What are positive ions? Well, the air is full of ions, electrically charged particles, and generally there is a rough balance between the positive and the negative charged. But sometimes this balance becomes disturbed and a larger proportion of positive ions are found. This happens naturally before thunderstorm, earthquakes when winds are blowing in certain countries. Or it can be caused by a build-up of static electricity indoors from carpets or clothing, or from TV sets, duplicators or computer display screens. When a large number of positive ions are present in the air many people experience unpleasant effects such as headaches, fatigue , excessive anger, and some particularly sensitive people feel sick or even suffer mental disturbance. Animals are also affected, particularly before earthquakes, snakes have been observed to come out, rats to flee from their burrows, dogs howl and cats jump about unaccountably. This has led the US Geographical Survey to fund a network of volunteers to watch animals in an effort to foresee such disasters before they hit vulnerable areas such as California. Conversely, when large numbers of negative ions are present, then people have a feeling of well-being. Natural conditions that produce these large amounts are near the sea, close to waterfalls or fountains, or in any place where water is sprayed, or forms a spray. This probably accounts for the beneficial effect of a holiday by the sea, or in the mountains with streams or waterfalls. To increase the supply of negative ions indoors, some scientists recommend the use of ionisers. They claim that ionisers not only clean and refresh the air but also improve the health of people sensitive to excess positive ions. Of course, there are the detractors, other scientists, who dismiss such claims and are skeptical about negative/positive ion research. Therefore people can only make up their own... Question: What is the author's attitude towards the use of ionisers? - Neutral. - Opposed. - Supportive. - Ambiguous.
A: Neutral.

Q: Read the following article and select the best answer. Article: The ancient city is in Pingyao county, Shanxi Province. The city wall was first built during the Zhou Dynasty. Since 1997, it has been listed as a World Heritage Site. Now Pingyao city is the only one in China completely protected as it was hundreds of years ago. The perimeter of this square city is 6.4km long and the city wall is the earliest and largest city wall in China. It is 12 m high with width of 5 m. The wall was built with earth and covered with bricks. Outside the city wall there is a river, 4 m wide and 4 m deep. There are several gates of the city, two each on the east and west and one each on the south and north side. All the gates have two doors each. This has given the city the name "Turtle City" with the two gates on the south and north standing for the head and tail of the turtle and four gates on the east and west as the four legs. The doors on the south and north stand opposite each other, like the head of the turtle extending out and two wells just beyond southern gate are like a turtle's two eyes. Located on the trade route between Beijing and Xi'an, Pingyao developed into a merchant center where the local people set up the nation's earliest banks. These banks were the first in China to use checks. Several old courtyards have been turned into museums, most of which were homes and offices of Pingyao's old banks. One of the most unusual aspects of a visit here is realizing that this place was very important to China's financial history. Question: Which gate in Pingyao city stands for the head of the turtle? - The gate on the north. - The gate on the south. - The gate on the east. - The gate on the west.
A: The gate on the south.

Q: Read the following article and select the best answer. Article: Motherhood may make women smarter and may help prevent dementia in old age by bathing the brain in protective hormones , U.S.researchers reported on Thursday. Tests on rats show that those who raise two or more litters of pups do considerably better in tests of memory and skills than rats who have no babies, and their brains show changes that suggest they may be protected against diseases such as Alzheimer's .University of Richmond psychology professor Craig Kinsley believes his findings will translate into humans."Our research shows that the hormones of pregnancy are protecting the brain, including estrogen , which we know has many neuroprotective effects," Kinsley said. "It's rat data but humans are mammals just like these animals are mammals," he added in a telephone interview."They go through pregnancy and hormonal changes." Kinsley said he hoped public health officials and researchers will look to see if having had children protects a woman from Alzheimer's and other forms of age-related brain decline. "When people think about pregnancy, they think about what happens to babies and the mother from the neck down," said Kinsley, who presented his findings to the annual meeting of the Society of Neuroscience in Orlando, Florida. "They do not realize that hormones are washing on the brain.If you look at female animals that have never gone through pregnancy, they act differently toward young.But if she goes through pregnancy, she will sacrifice her life for her infant--that is a great change in her behavior that showed in genetic alterations to the brain." Question: What can protect the brain of a woman according to the passage? - Estrogen. - The hormones of pregnancy. - More exercise. - Taking care of children.
A: The hormones of pregnancy.

Q: Read the following article and select the best answer. Article: Do you know about a series of books that say they are "for dummies"? These American selfhelp books have been translated into more than thirty nine languages including Chinese,Arabic,Russian,French,German,Greek and Spanish. "Dummy" is a word for a stupid person.The dummies books are not really for stupid people.They are designed to show people how to do something they may never have tried before,like painting a house or learning a language.The books all say in a funny way that they are for dummies,such as World History for Dummies,Rabbits for Dummies,Chinese Cooking for Dummies,and Wedding Planning for Dummies.The first such book,DOS for Dummies,was published in 1991.It helped people learn how to use the DOS operating system for computers.Since then,more than one hundred fifty million dummies books have been sold. The dummies.com website explains the idea behind the books.It says that they show people can be taught to do anything.First they can make fun of ideas that are difficult to understand.Then they show how the information can be interesting and easy.The publishers say that the books do not provide more information than necessary.They give readers just enough information to do what they want.They say that the dummies books give the best and easiest way to do something.And the books use simple and easy language. There are more than one thousand different dummies books.A report in New York Times says that the top-selling dummies books are those that explain technology and personal finance. The publishers say that the best-selling dummies books are those providing information many people need-like information about diseases,education and cooking.People interested in opera,car repair and wine can also find dummies books to help them.And there are even more dummies books to come.The publishers say that they publish about two hundred new dummies books every year. Question: According to New York Times,we know that books on _ sell best. - technology and personal finance - opera and car repairing - diseases and education - cooking and world history
A: technology and personal finance