*Question*
Read the following article and select the best answer. Article: Like distance runners on a measured course,all of us will move through time in a roughly predictable pattern. In the first stage of our lives,we develop and grow, reaching toward the top of physical vitality . After we grow up,however, the body begins a process of gradually wearing out. A new awareness of physical fitness may help lengthen our years of health and vitality,yet nothing we do will work to stop the unavoidable force of aging. Most of the changes of aging take place deep inside the body.The lungs become less able to take in oxygen.Powerful muscles gradually lose their strength.The heart loses power and pumps less blood.Bones grow easier to break. Finally, we meet a stress,a stress that is greater than our physical resistance.Often,it is only a minor accident or chance infection(a disease caused by virus),but this time, _ brings life to an end. In 1932,a classic experiment nearly doubled the lifetime of rats,simply by cutting back the calories in their diet The reason for the effect was then unknown. Today, at the University of California at Berkley, Dr.Paul Seagle has also greatly lengthened the normal lifetime of rats.The result was achieved through a special protein limited diet,which had a great effect on the chemistry of the brain.Seagle showed that within the brain,specific chemicals control many of the signals that influence aging.By changing that chemical balance,the clock of aging can be reset. For the first time, the mystery of why we age is being seriously challenged.Scientists in many fields are now making striking and far-reaching discoveries. An average lifetime lasts 75 years,yet in each of us lies a potential for a longer life.If we could keep the vitality and resistance to disease that we have at age twenty, we would live for 800 years. Question: The author believes the following except that _ . - human's life pattern is predictable - physical fitness can't stop the force of aging - human's lifetime will last longer than 75 years - all of the changes of aging take place deep inside the body
**Answer**
all of the changes of aging take place deep inside the body

*Question*
Read the following article and select the best answer. Article: The State Council declared Wednesday it would restart China's nuclear power program, ending the hiatus in nuclear construction since Japan's Fukushima nuclear disaster last year. China has been the most courageous country in building nuclear power, with the largest number of plants currently under construction. Nuclear power is facing a tough time in developed countries. The Japanese public is demanding the closure of all the country's nuclear power plants. China is at the forefront of nuclear power development. But it has been forced into this position. Rapid economic development coupled with improvements in people's life both demand more electricity. It is impossible to exploit fossil resources forever as the supply of coal, oil and natural gas is limited. China has no choice but to develop nuclear power. China must be the safest user of nuclear power. It should become a leading country in developing nuclear power technologies and increasing the world's knowledge of nuclear power. It needs to do at least two things. First, it needs to promote safety in nuclear power plants, based on the technologies of the West. The former Soviet Union, the US and Japan all had severe nuclear accidents, proving there are risks. China should try to remove these risks. Second, China should establish effective communication mechanisms between the government, power plants and the public. It's wrong to think the government can control every aspect of nuclear power plant construction. The opposition to nuclear power program in developed countries has prevented them from building new plants, but they already have many. These governments are reluctant to close these plants despite strong opposition, because they cannot find better substitutes. Nuclear power only occupies 1.8 percent of China's current electricity grid , much lower than the proportion in many developed countries. China's nuclear power plan should introduce the advantages of the technologies of other countries and also be creative in providing security. Its space... Question: . If the Chinese government is to develop nuclear power, it needs to _ . - copy exactly what the developed countries have done - depend entirely on domestic scientists and technologies - avoid people's involvement in nuclear power plant construction - do everything in its power to guarantee safety in nuclear power plants
**Answer**
do everything in its power to guarantee safety in nuclear power plants

*Question*
Read the following article and select the best answer. Article: Bananas are one of the world' s most important food crops. They are also one of the most valuable exports. Bananas do not grow from seeds. Instead, they grow from existing plants. Bananas are threatened by disease because all the plants on a farm are copies of each other. They all share the same genetic weaknesses. For example, the Cavendish banana is most popular in North American and European markets. However,some kinds of fungus organisms easily infect the Cavendish. Black Sigatoka disease affects the leaves of Cavendish banana plants. The disease is controlled on large farms by putting chemicals on the plant' s leaves. Farmers put anti-fungal chemicals on their crops up to once a week. Another fungal disease is more serious. Panama disease attacks the roots of the banana plant. There is no chemical treatment for this disease. Infected plants must be destroyed. Panama disease has affected crops in Southeast Asia, Australia and South Africa. There is concern that it may spread to bananas grown in the Americas. This could threaten an important export product for Central and South America. The International Network for the Improvement of Banana and Plantain supports research on bananas. The group has headquarters in France and other offices in the major banana-growing areas of the world. The group says that more research must be done to develop improved kinds of bananas. The group says that fungal diseases mainly affect only one kind of banana. In fact, there are five hundred different kinds of bananas. Food and Agriculture Organization of the United Nations has said that the Cavendish banana represents only 10% of world production. The U.N. agency says farmers should grow different kinds of bananas. This protects against diseases that affect only one kind. Experts warn that disease may cause the Cavendish banana to disappear. This happened earlier to another popular banana because of its genetic weakness against disease. Question: Panama disease _ . - doesn't belong to fungal disease - affects the leaves of banana plants - destroys bananas more seriously than Black Sigatoka disease - has spread to bananas all over the world
**Answer**
destroys bananas more seriously than Black Sigatoka disease