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Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

She worked here for a while then _________ afternoon she just quit and left.      
A.an                           
B.one                          
C.the                                      
D.Ø
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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.
            Pollution is a threat to many species on Earth, but sometimes it can cause species to thrive. Such is the case with Pfiesteria piscicida. A one-celled creature called a dinoflagellate, Pfiesteria inhabits warm coastal areas and river mouths, especially along the eastern United States. Although scientists have found evidence of Pfiesteria in 3,000-year-old sea floor sediments and dinoflagellates are thought to be one of the oldest life forms on earth, few people took notice of Pfiesteria.
            Lately, however, blooms – or huge, dense populations – of Pfiesteria are appearing in coastal waters, and in such large concentrations the dinoflagellates become ruthless killers. The blooms emit powerful toxins that weaken and entrap fish that swim into the area. The toxins eventually cause the fish to develop large bleeding sores through which the tiny creatures attack, feasting on blood and flesh. Often the damage is astounding. During a 1991 fish kill that was blamed on Pfiesteria on North California’s Neuse River, nearly one billion fish died and bulldozers had to be brought in to clear the remains from the river. Of course, such events can have a devasting effect on commercially important fish, but that is just one way that Pfiesteria causes problems. The toxins it emits affect human skin in much the same way as they affect fish skin. Additionally, fisherman and others who have spent time near Pfiesteria blooms report that the toxins seem to get into the air, where once inhaled they affect the nervous system, causing severe headaches, blurred vision, nausea, breathing difficulty, short-term memory loss and even cognitive impairment. For a while, it seemed that deadly Pfiesteria blooms were a threat only to North Carolina waters, but the problem seems to be spreading. More and more, conditions along the east coast seem to be favorable for Pfiesteria. Researchers suspect that pollutants such as animal waste from livestock operations, fertilizers washed from farmlands and waste water from mining operations have probably all combined to promote the growth of Pfiesteria in coastal water. 
What were bulldozers used for in the Neuse River?
A.cleaning up the sediment at the bottom of the river
B.excavating holes to bury the dead fish
C.scooping up the vast number of dead fish in the water
D.removing the huge amounts of Pfiesteria from the river

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 25 to 29.
Many parents believe that they should begin to teach their children to read when they are slightly more than toddlers. This is fine if the child chows a real interest but forcing a child could be counter-productive if she isn't ready. Wise parents will have a hopeful attitude and take the lead from their child. (25) _________ they should provide is a selection of stimulating toys, books and other activities. Nowadays there is plenty of good material available for young children, and of course, seeing plenty of books in use them to read.
Of course, books are no longer the only source of stories and information. There is also a huge range of videos, which can reinforce and extend the pleasure a child finds in a book and are (26) _________ helping to increase vocabulary and concentration. Television gets a bad review as far as children are concerned, mainly because too many spend too much time watching programmes not intended for their age (27) __________. Too many television programmes induce an incurious, uncritical attitude that is going to make learning much more difficult. (28) ________, discriminating viewing of programmes designed for young children can be useful. Just as adults enjoy reading a book after seeing it serialised on television, so children will pounce on books which (29) ________ their favourite television characters and videos can add a new dimension to a story known from a book.
(26)
A.properly         
B.worthily           
C.perfectly    
D.equally

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.
Earth is richly supplied with different types of living organisms which co-exist in their environments, forming complex, interrelated communities. Living organisms depend on one another for nutrients, shelter, and other benefits. The extinction of one species can set off a chain reaction that affects many other species, particularly if the loss occurs near the bottom of the food chain. For example, the extinction of a particular insect or plant might seem inconsequential. However, there may be fish or small animals that depend on that resource for foodstuffs. The loss can threaten the survival of these creatures and larger predators that prey upon them. Extinction can have a ripple effect that spreads throughout nature.
In addition to its biological consequences, extinction poses a moral dilemma for humans, the only species capable of saving the others. The presence of humans on the planet has affected all other life forms, particularly plants and animals. Human lifestyles have proven to be incompatible with the survival of some other species. Purposeful efforts have been made to eliminate animals that prey on people, livestock, crops, or pose any threat to human livelihoods. Some wild animals have been decimated by human desire for meat, hides, fur, or other body parts with commercial value. Likewise, demand for land, water, and other natural resources has left many wild plants and animals with little to no suitable habitat. Humans have also affected nature by introducing non-native species to local areas and producing pollutants having a negative impact on the environment. The combination of these human-related effects and natural obstacles such as disease or low birthrates has proven to be too much for some species to overcome. They have no chance of survival without human help.
As a result, societies have difficult choices to make about the amount of effort and money they are willing to spend to save imperiled species. Will people accept limits on their property rights, recreational activities, and means of livelihood to save a plant or an animal? Should saving such popular species as whales and dolphins take priority over saving obscure, annoying, or fearful species? Is it the responsibility of humans to save every kind of life form from disappearing, or is extinction an inevitable part of nature, in which the strong survive and the weak perish? These are some difficult questions that people face as they ponder the fate of other species living on this planet.
(Source: http://www.encyclopedia.com)
What does the passage mainly discuss?
A.The importance of living organisms   
B.Humans and endangered species
C.Causes of animal extinction
D.Measures to protect endangered species

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