单选题The word "presumably" in line 21 is closest in meaning to

单选题The fact that the "land is largely the site of erosion" (line 7) is significant because

单选题The phrase "account for" in line 22 is closest in meaning to

单选题n me eighteenth century, quilting became a common technique in foe American colonies for the make of coverlets sewed in floral and geometric designs.

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单选题The snapper, a large-headed fish with a long dorsal fin, is named to its characteristic way of suddenly shutting its mouth.

单选题(Addressing) themes that were (unique) American, the poet Walt Whitman (celebrated) the lives of (ordinary people).

单选题1. What is the woman's problem? A. She does not have enough time to finish writing her paper. B. She is concerned about receiving a poor grade in history. C. She is confused by her professor's response to her paper. D. She does not think her professor graded her paper fairly. ABCD C [解析] M: Hi, Kelsey! How's it going?W: Well, I don't know. I just got my history paper back, and my professor didn't grade it. He just wrote on it, "Come and talk to me about this."M: Really? Is that all he said? Didn't he make any other comments?W: No. So I'm really confused. This is the first time I ever got a paper back with no grade on it.M: That is strange, isn't it?W: Sure is. I did everything I was supposed to. I mean, I followed the instructions of the assignment.M: You'd better go talk to him. You need to find out what he's thinking.W: Yeah, I will. I hope he doesn't ask me to rewrite the paper.What is the woman's problem?The woman is confused by her professor's response to her paper. She says: So I'm really confused. This is the first time I ever got a paper back with no grade on it.

单选题Why are otters and mussel shells included in the discussion in paragraph 3?

单选题The phrase "rather than" in line 21 is closest in meaning to

单选题___ 363 miles between the cities of Albany and Buffalo in New York State, the Eric Canal helped link the Atlantic Ocean with the Great Lakes.

单选题It can be inferred from the passage that newmarkets opened in Philadelphia because

单选题Listen to Track 67. A. It is not obvious how whales find their way. B. Different whales have different ways of locating food. C. Whales have a poor sense of orientation. D. Scientists have not been able to track the whales.

单选题The word "undergoing" in line 22 is closest in meaning to

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单选题Earthquake Every year throughout the world approximately 6000 earthquakes are detected. The vast majority of these are either too small or too far from populated areas to be felt. Several hundred, however, are felt and the majority of these, while frightening, are relatively harmless. A small number of earthquakes, however, are severe enough to cause serious damage to property, as well as injuries and even deaths. Earthquakes are a serious concern in major cities such as Tokyo, Mexico City, Los Angeles and San Francisco, which lie on or near earthquake faults. Earthquakes are a result of the earth"s continuous friction movements along fault lines. Tectonic plates grind past or along side each other without interruption in areas that are prone to earthquakes. These sliding moves are only traced by seismologists in their labs, and are not evident for people going about their day to day lives. However, when the moving tectonic plates do not glide smoothly by one another, the resulting collision gives rise to tremors and shudders. Stronger impacts result in earthquakes. Major earthquakes, while uncommon, rank among the deadliest of natural catastrophes . In the 20th Century, an average of 15,000 people has died every year due to earthquakes. Many deaths are caused by collapsed buildings, houses, bridges and other structures. Much damage—both in terms of material and human lives—however, is the result of side effects produced by earthquakes, such as tidal waves, landslides, avalanches, fires and the collapse of dams. Additionally, serious earthquakes may devastate a city"s infrastructure, resulting in contaminated drinking water, impassable roads, and disruptions in the supply of power and phone service. If damage to a city"s sanitation system and disruption of food and water supplies lasts for a longer time, earthquakes can cause significant injury and death long after the shaking of the earthquake itself has subsided . Because earthquakes are inevitable , a program of hazard reduction is the only way to combat the severe damage earthquakes can inflict on life and property. Seismologists still cannot accurately predict the timing of earthquakes, but they can identify areas which are subject to seismic risk. Education of the population about the dangers of earthquakes and what to do in the event one occurs is important in limiting damage. A number of nations, particularly the U.S. and Japan, have implemented stringent building codes which take into account the possibility of earthquakes in the design of buildings. The other way to limit the damage caused by earthquakes is the implementation of programs of emergency procedures in the event of an earthquake. These include evacuation plans, backup power sources and communication systems designed to keep citizens informed in the event of an earthquake. For several years now, the Pacific Northwest has been in a vast state of preparedness in the event of an earthquake. Seismologists have long warned against the imminent danger of a major earthquake striking the Seattle—Portland metropolitan area. Such warnings come on the heel of recently tracked tremors along the Juan de Fuca fault line that borders the northwestern U.S. states. No major earthquake has hit the area in more than a few decades, and a huge one is bound to occur anytime soon. Glossary fault: a crack in the earth"s crust resulting from the displacement of one side with respect to the other infrastructure: the stock of basic facilities and capital equipment needed for the functioning of a country or area property: any tangible or intangible possession that is owned by someone seismologist: a scientist who studies earthquakes

单选题The sensation of sound is produced how vibrations transmitted through the air strike the eardrum.

单选题The passage mentions all of the following as ways adults modify their speech when talking to babies EXCEPT

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