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 below.
    It is estimated that about 200 million people use the Internet computer network around the world. The Internet allows people to work at home instead of travelling to work. The Internet allows businesses to communicate with customers and workers in many parts of the world for the cost of a local telephone call.
   E-mail allows users to send documents, pictures and other data from one part of the world to another in at least 5 minutes. People can use the Internet to do shopping. This saves a lot of time. It is possible to use the Internet for education - students may connect with their teachers from home to send or receive e-mail or talk their problems through "online" rather than attending a class.
To a business, the Internet is......to communicate with customers.

A.a cheap way
B.an inconvenient way
C.a difficult way   
D.a very expensive way

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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
Plants and animals will find it difficult to escape from or adjust to the effects of global warming. Scientists have already observed shifts in the lifecycles of many plants and animals, such as flowers blooming earlier and birds hatching earlier in the spring. Many species have begun shifting where they live or their annual migration patterns due to warmer temperatures.
With further warming, animals will tend to migrate toward the poles and up mountainsides toward higher elevations. Plants will also attempt to shift their ranges, seeking new areas as old habitats grow too warm. In many places, however, human development will prevent these shifts. Species that find cities or farmland blocking their way north or south may become extinct. Species living in unique ecosystems, such as those found in polar and mountaintop regions, are especially at risk because migration to new habitats is not possible. For example, polar bears and marine mammals in the Arctic are already threatened by dwindling sea ice but have nowhere farther north to go.
Projecting species extinction due to global warming is extremely difficult. Some scientists have estimated that 20 to 50 percent of species could be committed to extinction with 2 to 3 Celsius degrees of further warming. The rate of warming, not just the magnitude, is extremely important for plants and animals. Some species and even entire ecosystems, such as certain types of forest, may not be able to adjust quickly enough and may disappear. Ocean ecosystems, especially fragile ones like coral reefs, will also be affected by global warming. Warmer ocean temperatures can cause coral to “bleach”, a state which if prolonged will lead to the death of the coral. Scientists estimate that even 1 Celsius degree of additional warming could lead to widespread bleaching and death of coral reefs around the world. Also, increasing carbon dioxide in the atmosphere enters the ocean and increases the acidity of ocean waters. This acidification further stresses ocean ecosystems.
According to the passage, if some species are not able to adjust quickly to warmer temperatures, ______.
A.they may be endangered
B.they can begin to develop
C.they will certainly need water
D.they move to tropical forests