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Read the following article and select the best answer. Article: A rapidly advancing contemporary science that is highly dependent on new tools is Earth system science. Earth system science involves observation and measurements on the Earth at all scales from the largest to the smallest. The huge amounts of data that are gathered come from many different locations and require special techniques for handling data. Important new tools that facilitate Earth system science include satellite remote sensing, small deep-sea submarines, and geographic information systems. More than any other way of gathering evidence, satellite observations continually remind us that each part of the Earth interacts with and is dependent on all other parts. Earth system science was born from the realization of that interdependence. Satellite remote sensing makes possible observations at large scales, and in many cases, measurements of factors that could not otherwise be measured. For example, the ozone hole over Antarctica--the decrease in the concentration of ozone high in the atmosphere--is measured by remote sensing, as are changes in deserts, forests, and farmlands around the world. Such measurements can be used in many areas of specialization besides Earth system science. Archaeology, for example, has benefited from satellite observations that reveal the traces of ancient trade routes across the Arabian Desert. New tools for exploring previously inaccessible areas of the Earth have also added greatly to our knowledge of the Earth system. Small deep-sea submarines allow scientists to travel to the depths of the ocean. There they have discovered new species and ecosystems thriving near deep-sea vents that emit heat, sasses, and mineral-rich water. Just as important as new methods of measurement and exploration are new ways to store and analyze data about the Earth system. Computer-based software programs known as geographic information systems, or GIS, allow a large number of data points to be stored along with their locations. These can be used to produce maps and to compare different sets of... Question: According to the passage, satellite observations of the Arabian Desert allow archaeologists to know _ . - indications of ancient routes - evidence of former lakes - traces of early farms - remains of ancient forests
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indications of ancient routes

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Read the following article and select the best answer. Article: Although April did not bring us the rains we all hoped for, and although the Central Valley doesn't generally experience the sound and lightning that can go with those rains, it's still important for parents to be able to answer the youthful questions about thunder and lightning. The reason these two wonders of nature are so difficult for many adults to explain to children is that they are not very well understood by adults themselves. For example, did you know that the lightning we see flashing down to the earth from a cloud is actually flashing up to a cloud from the earth? Our eyes trick us into thinking we see a downward motion when it's actually the other way around. But then, if we believed only what we think and we see, we'd still insist that the sun rises in the morning and sets at night. Most lightning flashes take place inside a cloud, and only a few can be seen jumping between two clouds or between earth and a cloud. But, with about 2,000 thunderstorms taking place above the earth every minute of the day and night, there's enough _ to produce about 100 lightning strikes on earth every second. Parents can use thunder and lightning to help their children learn more about the world around them. When children understand that the light of the lightning flashing reaches their eyes almost at the same moment, but the sound of the thunder takes about 5 seconds to travel just one mile, they can begin to time the interval between the flash and the crash to learn how close they were to the actual spark . Question: What is TRUE about lightning according to the passage? - Only a small number of lightning flashes occur on earth. - Lightning flashes usually jump from one cloud to another. - Lightning travels 5 times faster than thunder. - There are far more lightning strikes occurring on earth than we can imagine.
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There are far more lightning strikes occurring on earth than we can imagine.

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Read the following article and select the best answer. Article: I still remember the days when I was a youthful student in an engineering school. I lived a casual life, without caring about the future. I smoked, drank with friends and made girl friends. Little did I realize that casualness would certainly lead to loss. Two years had passed and I was staring down a report card that highlighted FAIL in more than half the subjects. I didn't care, at least not till my dad found out about it. You see, I studied in India and unlike the United States where the students are expected to finance their own education, my dad financed me. Then came the day when my dad found out my habit of smoking. He lost his temper but he just told me, "Son, your allowance is cut in half from this moment on". It hit me like a roundhouse kick from Bruce Lee. I was jolted out of my bones! I couldn't comprehend how to pay off the debts that I had accumulated in college. I owed everybody money: the grocery store, the bars, the restaurants, my friends, etc. I was living a life filled with credit. When I went back to college, I knew that if I don't change the way I live my life I won't be able to pay everybody off. So I decided to make some changes, drastic changes. I quit smoking, cut off from my friends who led me down the wrong road, starting hanging out in libraries and reading my engineering books. One year later, I went from a miserable failure to a magna cum laude . . This incident made me know that anything is possible if you take action and do something about it, however small or large. Even today it still motivates me when I feel that I'm about to lose or give up. It reminds me that I can do it! Question: The author didn't care about his study until _ . - he entered the engineering school - he was in heavy debt he couldn't bear - he decided to give up smoking - his allowance was cut in half
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his allowance was cut in half