Ques:Read the following article and select the best answer. Article: Below is a selection from a popular science book. If blood is red, why are veins blue? Actually, veins are not blue at all. They are more of a clear, yellowish colour. Although blood looks red when it's outside the body, when it's sitting in a vein near the surface of the skin, it's more of a dark reddish purple colour. At the right depth, these blood-filled veins reflect less red light than the surrounding skin, making them look blue by comparison. Which works harder, your heart or your brain? This question depends on whether you're busy thinking or busy exercising. Your heart works up to three times harder during exercise, and shifts enough blood over a lifetime to fill a supertanker. But, in the long run, your brain probably tips it, because even when you're sitting still your brain is using twice as much energy as your heart, and it takes four to five times as much blood to feed it. Do old people shrink as they age? Yes and no. Many people do get shorter as they age. But, when they do, it isn't because they're shrinking all over. They simply lose height as their spine becomes shorter and more curved due to disuse and the effects of gravity . Many (but not all) men and women do lose height as they get older. Men lose an average of 3-4 cm in height as they age, while women may lose 5 cm or more. If you live to be 200 years old, would you keep shrinking till you were, like 60 cm tall, like a little boy again?No, because old people don't really shrink!It is not that they are growing backwards--their legs, arms and backbones getting shorter. When they do get shorter, it's because the spine has shortened a little. Or, more often, become more bent and curved. Why does spinning make you dizzy ? Because your brain gets confused between what you're seeing and what you're feeling. The brain senses that you're spinning using special gravity and motion sensing organs in your inner ear, which work together with your eyes to keep your vision and balance stable. But when you suddenly stop spinning , the system goes out... Question: Why do some old people look a little shrunken as they age? - Their spine is in active use. - They are more easily affected by gravity. - They keep growing backwards. - Their spine becomes more bent.

Ans:Their spine becomes more bent.
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Ques:Read the following article and select the best answer. Article: South Africa hosted the fifth BRICS Summit in March 2013,which completed the first cycle of BRICS summits,BRICS is an acronym for the powerful grouping of the world's leading up-and-coming economies,namely Brazil,Russia,India,China and South Africa.The BRICS aims to achieve peace,security,development and cooperation.It also seeks to contribute to the development of humanity and build a more stable and fairer world. The industry leaders from the business communities of the five countries agreed that the BRICS countries will actively support industrialization on the African continent in order to contribute significantly to its development and to expand trade links between Africa and BRICS.The global economic situation,though improving,continues to remain uncertain with the Euro-crisis a major concern.The task ahead is to build on these developments and BRICS countries remain committed to the cause of promoting sustainable growth.Greater economic cooperation among BRICS countries can be significantly important,which will prove beneficial for global economic growth. According to Dr.Rob Davies,South African Minister of Trade and Industry,the African continent is recognized as the second fastest growing continent after Asia.There are four drivers of the economic growth in African continent.These are the boom in mineral products in the African continent,the development of the service industries,the benefit of not having the financial crisis,and infrastructure development.Davies also adds that other BRICS countries have advantage of large populations providing big home markets for their products.The South African population is small compared to other BRICS countries,but if you add up numbers on continent then you have a critical mass that can support the new industrial wave in Africa:That is why the South African needs to create large trading blocks across large parts of African continent. Question: The author believes greater cooperation among BRICS will _ , - promote global economic growth - bring more challenges - narrow the gap of development - solve Europe's economic crisis

Ans:promote global economic growth
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Ques:Read the following article and select the best answer. Article: The Arctic Fox Characteristics The arctic fox is dark gray to bluish brown in the summer. In the winter its fur is white or creamy white. It has a long bushy tail, a short nose and small, curled back ears. It has short legs and thick fur. Its short legs and nose, thick fur and small ears are adaptions that help it survive in cold climates. Because its legs are so short and its ears and nose are small, they are less exposed to the cold. The arctic fox also has thick fur and hair on its paw pads that help keep it warm. When the arctic fox is sleeping, it protects its nose from the cold by curling its bushy tail around its body. The arctic fox is about three feet long and weighs between five and fifteen pounds. Males are larger than females. Diet The arctic fox is an opportunities eater. It will eat just about whatever it comes across. It eats small mammals like lemmings and it also eats birds, insects and eggs. In fact, in the winter it often follows polar bears and wolves and eats their leftover kill. In the summer the arctic fox will carry extra food to its den and store it under rocks to eat later. The arctic fox sometimes even makes its own freezer by digging a hole in the permafrost and storing its food there. A major source of food for the arctic fox is the lemming. In fact, the arctic fox population often peaks every four years in a cycle that follows lemming population changes. Life Cycle The arctic fox mates between February and June. The female builds a new den and gives birth to between six and twelve dark--furred kits. Both the female and the male will take care of the young kits. The male will guard the den and bring food to the den for the mother and the kits. The kits are weaned when they are between two and four weeks old and then they will start to leave the den. Question: What can we learn about the arctic fox's diet? - It eats only one kind of food - It will carry extra food to its den in the winter - It eats the leftovers of other animals in winter - It is difficult to hunt lemmings as food.

Ans:
It eats the leftovers of other animals in winter
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