Ques:Wisdom teeth are normally the last teeth to appear.This usually happens when people are in their late teen years or early twenties,in other words,when they are older and wiser. Wisdom teeth can grow into place normally and never cause a problem.But often there is not enough room for them in the mouth;they might crowd other teeth.Sometimes they even push sideways through the gums  . An impacted wisdom tooth is one that fails to completely rise through the gums.Wisdom teeth that only partly break through can leave space for bacteria to enter around the teeth.Infection   is a risk in these cases. Wisdom teeth that are not well lined and become impacted are often removed.The American Dental Association says removal is generally advised when wisdom teeth only partly break through the gums.Removal is also advised if there is a chance that wisdom teeth ate poorly lined.The best time to remove is before the teeth cause any problems or pain.Young adults are the best candidates for wisdom teeth removal. But why do we have wisdom teeth if we often need to get them removed?One theory has to do with our diets.Scientists say the diet of ancient humans probably required more chewing teeth.Life was probably a little rougher on the teeth back then,too.So it was good to have extras. The main purpose of the passage is to   _   . A) advise B) persuade C) comment D) introduce

Ans:D
-----
Ques:Once upon a time two brothers who lived on neighboring farms fell into conflict . It was the first serious one in 40 years of farming side by side, sharing machinery, and trading labor and goods as needed.       Then the long cooperation fell apart. It began with a small misunderstanding and it grew into a major difference, and finally it exploded into an exchange of bitter words followed by weeks of silence.       One morning there was a knock on John' door. He opened it to find a man with a carpenter's toolbox. "I'm looking for a few days' work," he said. "Could I help you?"      "Yes," said the older brother. "I do have a job for you. Look across the creek  at that farm. That's my neighbor, in fact, it's my younger brother. Last week there was a meadow  between us and he took his bulldozer  to the levee  and now there is a creek between us. Well, he may have done this to spite me, but I'll go him one better. I want you to build me a fence--an 8-foot fence --so I won't need to see his place anymore. Cool him down, anyhow."      The carpenter said, "I think I understand the situation. I'll be able to do a job that pleases you." The older brother had to go to town for supplies, so he helped the carpenter get the materials ready and then he was off for the day.   The carpenter worked hard all that day measuring, sawing, nailing. About sunset when the farmer returned, the carpenter had just finished his job. The farmer's eyes opened wide, his jaw dropped.       There was no fence there at all. It was a bridge-- a bridge stretching from one side of the creek to the other! A fine piece of work-- and his younger brother was coming across, his hand outstretched.   "You are quite a fellow to build this bridge after all I've said and done."   The brothers stood at each end of the bridge, and then they met in the middle, taking each other's hand. They turned to see the carpenter lift his toolbox on his shoulder. "No, wait! Stay a few days. I've a lot of other projects for you," said the older brother.   "I'd love to... Which of the following is NOT true according to the passage? A) The younger brother used his bulldozer to dig a creek. B) After the conflict John was angry with his younger brother. C) At first the carpenter planned to build an 8-foot fence as John asked him to. D) The two brother made peace at last.

Ans:C
-----
Ques:On May 23rd the United States Department of Agriculture will meet to discuss the pressing topic of wild pigs. These beasts, which number 6 million or so, are an increasing bother. At their worst, they can damage crops, spread diseases, attack humans and kill farm animals. And things are getting worse: a study show that they are likely to double in number over the next 3 years. Why is it so hard to control wild pigs? Introduced to America in the 16th century, and related to the wild pigs found in Europe, wild pigs can be found in 75% of all states. No single law exists to control them and regulations differ between states: while in Missouri they can only be shot if met by chance, in Texas hunting is actively encouraged. A "pork chopper" law allows Texan hunters to shoot wild pigs from helicopters, and some people in Louisiana have even built their own pighunting drone . As well as being popular with hunters, wild pigs are cheaper for game raisers to breed than deer. In Michigan and Pennsylvania suggested bans on the private breeding of pigs for hunting have caused quarrels between game raisers and wildlife officials. Wild pigs' double nature----considered pests by farmers, but valued by hunters----makes it hard to pass laws  to control them. Two other factors also contribute. Nearly 70% of land in America is privately owned. And it is difficult for lawmakers to impose breeding and hunting laws on private landowners. Secondly, it is hard to define a wild pig. In some states, laws are being introduced to redefine the term "wild animal" to keep out wild pigs. This is good news for those raising pigs for hunting, but less are to those who consider them pests whose number should be limited. Meanwhile, discussions continue over how to deal with this problem. People are not permitted to hunt wild pigs freely in   _  . A) Texas B) Michigan C) Missouri D) Louisiana

Ans:C
-----
Ques:The canopy, the upper level of the trees in the rain forest, holds too much of climbing mammals   of moderately large size, which may include monkeys, cats, civets, and porcupines. Smaller species, including such as nice and small squirrels, are not as common overall in high tropical canopies as they are in most habitats globally. Small mammals, being warm blooded, suffer hardship in the exposed and uncertain environment of the uppermost trees. Because a small body has more surface area per unit of weight than a large one of similar shape, it gains or loses heat more rapidly. Thus, in the trees, where protection from heat and cold may be scarce and conditions may be changeable, a small mammal may have trouble maintaining its body temperature. Small size makes it easy to scramble among twigs   and branches in the canopy for insects, flowers, or fruit, but small mammals are defeated, in the competition for food, by large ones that have their own strategies for browsing among tbod-rich twigs. The weight of an ape hanging below a branch draws the leaves down so that fruit-bearing leaves drop toward the ape's face. Walking or leaping species of a similar or even larger size access the outer twigs either by breaking and gaining the whole branch or by catching hold of hard branches with the feet or tail and picking food with their hands. Small climbing animals may reach twigs readily, but it is harder for them than for large climbing animals to cross the wide gaps from one tree top to the next that typify the high canopy. A gibbon can hurl itself farther than a mouse can: it can achieve a running start, and it can more effectively use a branch as a springboard  . The forward movement of a small animal is seriously reduced by the air friction   against the  ly large surface area of its body. Which of the following questions does the passage answer? A) How is the rain forest different from other habitats? B) How does an animal's body size influence an animal's need for food? C) Why does rain forest provide an unusual variety of food for animals? D) Why do large animals tend to dominate the upper canopy of the rain forest?

Ans:
D
-----