The kid looks nervous when his idol standing ... him on the stage. a. over b. before c. right to d. inside e. next to

Man : Hi, Anna. What are you doing here? Woman: I'm waiting for a taxi. Man : Have you ordered yet? Woman: Not yet. I don't bring my cell phone. Man : What if I take you home? I have twobhelmets. Woman:... What is the suitable response to say next? A. Sorry, I'm busy. B. I don't think you can. C. That's very kind of you. D. I'll help you then E. That's a good idea.

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Since 1929, physicists have known that the universe is expanding. Most physicists hold that the entire observable universe was condensed into a tiny area of exceptional density and that this initial mass exploded outward in what is commonly referred to as the "Big Bang." The universe has been expanding steadily ever since this cataclysmic event and most physicists naturally assumed that this expansion must be gradually slowing down. Some theorists even predicted that the gravitational pull of the universe would cause the eventual contraction of the universe-the "Big Crunch." However, in 1998, a team of observers studying supernovae made a shocking discovery. Instead of slowing down, the expansion of the universe is accelerating. In fact, the acceleration appeared to have begun some 1 0 billion years ago. Later measurements of the cosmic microwave background and a survey of the distribution of galaxies seem to corroborate the initial finding that the expansion of the universe is indeed accelerating. Cosmologists believe the most likely explanation for the acceleration of the universe's expansion is an entity known as dark energy According to theory, dark energy should account for approximately two-thirds of the total cosmic energy density. It also is believed to be gravitationally repulsive and diffused throughout the areas of space unoccupied by galaxies. Although theoretically possible dark energy, if it were found to exist, would provide theorists with a number of difficulties and perhaps even require an extensive rethinking of fundamental physics. Some cosmologists believe that the existence of dark energy implies the existence of subatomic particles more than thirty orders of magnitude smaller than the electron. Others have tinkered with Einstein's theory of relativity in an attempt to account for the perceived effects of dark energy. Such drastic revisions to long-held tenets have encouraged some physicists to seek a more conventional solution to the accelerating universe enigma, one that does not invoke the specter of dark energy. These theories posit more mundane explanations, such as the aggregate gravitational effect of interstellar dust. Recently, four independent groups have found evidence of the integrated Sachs-Wolfe effect, a phenomenon linked to the presence of dark energy. The passage implies that the expansion of the universe ... . A. has been continuing for approximately 10 billion years B. was assumed in most theoretical models of the universe C. will eventually slow down and stop, leading to a "Big Crunch" D. is thought to result from the initial conditions of the universe E. is continuing to accelerate at a constant rate

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Jawaban terverifikasi

The increase in tropical stroms in recent year has been...Global warming

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Jawaban terverifikasi

12. In Japan, students ... to sweep the hall floors before they go home at the end of the day. a. should have forgotten b. shouldn't forget c. should be forgetting d. should forget e. should be forget

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Why Do Droughts Happen? A drought is a shortage of precipitation over a period of time. A drought begins with a disruption to the water cycle, the circulation of water from the Earth's atmosphere to its surface. The water cycle doesn't always operate so smoothly. When it doesn't, an area can have a drought or a flood. Changes in air pressure can affect the water cycle. Air pressure is the force with which the air presses against everything. This force is caused by gravity. Air rises when there is low air pressure at ground level. This rising air carries water vapor, which can create clouds and precipitation. Air sinks when there is high pressure at ground level. The high pressure prevents the air from rising to create clouds and precipitation. If a high-pressure system stays in an area for a long time, it can cause a drought. Most droughts are temporary, and can occur in all climates. Some climates are permanently dry, or arid, such as desserts. Droughts get worse when rivers and streams dry up, so they cause people without water to drink and to grow food. Adanted from: Droughts Question 5. When are droughts called worse?

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