Choose the best answer to complete the following sentences.
If you play this stereo on.................volume, you’ll go deaf!
A.minimum  
B.maximum
C.exact     
D.sudden

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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 following questions from 1 to 5.
Dolphins are one of the most intelligent species on the planet, which makes them a very interesting animal to scientists. In their natural habitats, dolphins use various vocalization techniques. They whistle and squeak to recognize members of their pod, identify and protect their young, and call out warnings of danger. They also make clicking sounds used for echolocation to find food and obstacles in dark and murky waters.
Amazingly, the whistling sound that the bottlenose dolphin makes has been found to have a similar pattern to human language. They always make conversational sounds when they greet each other. If you listen to dolphins' squeaks and squeals, it will sound like they are having a conversation.
Dolphins usually use both sound and body language to communicate with each other. It is through gesture and body language, however, that most of their communication with humans comes. Dolphins can be trained to perform complicated tricks. This suggests they have a high level of intelligence and communication capacity. If they work for a long time with a trainer, they are able to recognize and understand human commands.
A lot of dolphin communication has been studied using dolphins in captive environments. These studies have been criticized because some marine biologists believe that dolphins living in aquariums or research centers cannot be considered "normal." Even so, most believe that studying dolphin communication in captivity is useful for beginning to understand the complexity of dolphin communication. After all, dolphins are one of the most intelligent animals. Their ability to communicate is impressive and worthy of study. 
According to paragraph 4, what do some marine biologists think about captive dolphins?
A.Their relationships are too personal with marine biologists. 
B.They can't be considered accurate subjects for biological studies. 
C.They can communicate exactly the same as humans do.
D.They easily demonstrate how dolphins act in the wild.

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.
           Around 200 million people are employed in tourism worldwide, making it the largest industry in the modern global (25)________ . It is estimated that three-quarters of a billion people go on holiday each year, and industry planners expect this figure to double by 2020. Some of the biggest beneficiaries are less developed countries, where it is often their main source of income.
            (26)________, along with the economic benefits, this mass movement of people has resulted in threats to the environment. People often forget the damage caused by carbon dioxide emissions from aircraft, (27)________ contribute directly to global warming. Deforestation has cleared land in order to build hotels, airport and roads, and this has destroyed wildlife. In some areas, water shortages are now common because of the need to fill swimming pools and water golf courses for tourists. By pushing up prices for goods and services, tourism can also be (28)________ to the people who live in tourist destinations.
            In response to these concerns, some travel operators now offer environmental friendly holidays. Many of these aim to reduce the negative effect of tourism by (29)________ only hotels that have invested equipment to recycle waste and use energy and water efficiently. Increasingly, tourists are also being reminded to show respect for the customs of the people whose countries they are going to visit, and to support local businesses, such as restaurants and shops, which depend on tourism for their main income.
                                                                                                                        (Source: Internet)
(26) 
A.However                
B.In addition    
C.Therefore                
D.Moreover