Read the following article and select the best answer. Article: Sustainable development is applied to just about everything from energy to clean water and economic growth, and as a result it has become difficult to question either the basic assumptions behind it or the way the concept is put to use. This is especially true in agriculture, where sustainable development is often taken as the measure of progress without a proper appreciation of historical and cultural perspectives. To start with, it is important to remember that the nature of agriculture has changed markedly throughout history, and will continue to do so. Medieval agriculture in northern Europe fed, clothed and sheltered a mainly rural society with a much lower population density than it is today. It had minimal effect on biodiversity, and any pollution it caused was typically localized. In terms of energy use and the nutrients captured in the product it was relatively inefficient. Contrast this with farming since the start of the industrial revolution. Competition from overseas led farmers to specialize and increase yields. Throughout this period food became cheaper, safer and more reliable. However, these changes have also led to habitat loss and to reducing biodiversity. All this means that agriculture in the 21st century will have to be very different from how it was in the 20th. This will require thorough thinking. For example, we need to move away from the idea that traditional practices are certainly more sustainable than new ones. We also need to abandon the notion that agriculture can be "zero impact". The key will be to abandon the rather simple and static measures of sustainability, which centre on the need to maintain production without increasing damage. Instead we need a more dynamic interpretation, one that looks at the pros and cons of all the various way land is used. There are many different ways to measure agricultural performance besides food yield: energy use, environmental costs, water purity, carbon footprint and biodiversity. It is clear, for example, that the carbon of transporting... Question: What is the author's purpose in writing this passage? - To remind people of the need of sustainable development. - To urge people to rethink what sustainable agriculture is. - To advance new criteria for measuring farming progress. - To suggest ways of ensuring sustainable food production.
To urge people to rethink what sustainable agriculture is.

Read the following article and select the best answer. Article: Two of the most dangerous storms which hit America are hurricanes and tornadoes. They are very much feared by anyone who may live in the path of their destruction and cause millions of dollars of damage to life and property every year. If one should travel inland across the Great Plains and the Prairie states of America, one will mostly not experience a hurricane, but there is another kind of storm in the Midwest which is equally feared. It is called a tornado. Tornados are violent low-pressured storms with an intense updraft near their center which is capable of lifting quite heavy objects from the ground. A tornado,therefore, is a dark, funnel-shaped cloud containing violently rotating air. It can pick up trees and cars right into the air and even uplift heavier objects such as homes and railway cars. Like a vacuum cleaner across a rug, it sucks up into anything which may lie in its path. These storms occur most often during the summer months and are noticeable by their strong wind and lack of rain. The sky turns black as dust is sucked up into the air. Tornadoes travel normally around 60 kilometers per hour and the winds can reach 800 kilometers per hour in the most violent storms. Tornados are most frequent in the United States east of the Rocky Mountains and especially in the central plains area of the Mississippi basin where about 150 occur each year. Tornados may also strike the southern states in winter and have even seen known to develop in the northeast. Both hurricanes and tornados cause millions of dollars worth of damage each year. Today they can be predicted more easily than in the past, but they cannot be stopped or ignored. When they come, they must be endured with the hope that one survives their fury and wraths. Question: All of the following are true EXCEPT that _ . - tornados cannot be predicted now - the sky turns black when a tornado happens - tornados usually travel about 60 kilometers an hour - the winds can reach 800 kilometers per hour in the most violent storms
tornados cannot be predicted now

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Read the following article and select the best answer. Article: (RAMALLAH, West Bank) -- Israel freed 26 Palestinian prisoners early Wednesday, the second of four groups to be released as part of an agreement that started the current Israeli-Palestinian peace talks, which had broken down since 2008. In all, 104 prisoners are to be released in four rounds over the coming months. In the West Bank and Gaza , the mood was overexcited as hundreds of Palestinians welcomed the prisoners back home, after many had spent more than 20 years behind bars. Crowds of people rushed toward the 5 prisoners released to Gaza, raising them on their shoulders, waving Palestinian flags and dancing to music. Relatives held signs that read "we will never forget our heroes." More than 2,000 people welcomed the 21 prisoners released to the West Bank, who were greeted at a ceremony by Palestinian President Mahmoud Abbas in Ramallah. Hazem Shubair, thrown into prison in 1994 for the death of an Israeli according to the Israeli Prison Service, was over delighted upon his return to Gaza. "I am speechless," he said. "Thanks to God. God is greater than the aggressors (meaning Israel)". Abbas said a final peace agreement with Israel was possible on the release of the prisoners. "There will be no final agreement without the release of all the prisoners," he told the violent crowd. Israel's Supreme Court earlier refused an appeal that intended to cancel the prisoner release. An organization of bereaved families behind the appeal has said it fears the prisoners, all in connection to the deaths of Israelis, will return to violence once freed. Question: There will be no final peace agreement between Israel and Palestinians until _ . - all the Palestinian prisoners kept in Israeli prisons are set free - all the prisoners return to violence once again - God is greater than the aggressors - Palestinians welcome some prisoners back home
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all the Palestinian prisoners kept in Israeli prisons are set free