练习说明
Questions 33 – 35
Complete the summary using the list of words, A-G, below
Write the correct letter, A-G, in boxes 33-35 on your answer sheet.
原文
Sea levels around New Zealand have risen by 25 cm since the middle of the 19th century and by 7 cm since1950. Predictions for the coming years cover a wide range, however, partly because of unknown rises resulting from the melting of the ice in the Arctic, Greenland and Antarctica. In addition, sea level at any given time is affected by many different factors, one of which is called storm surge. At the centre of a severe storm, atmospheric pressure is low and the sea bulges upwards and outwards. When a storm coincides with a high tide along low- lying coastal areas, this bulge raises the tide higher than normal, creating a surge not unlike a slow-motion tsunami. Not only does a rise in sea level increase the potential for this sort of damage, it also has less immediate impacts. One potentially grave outcome is that groundwater systems may become contaminated with salt water, spoiling them for the irrigation of farmland, which in turn could diminish crop harvests. Similarly, over time, estuaries may be enlarged by erosion as tidal influences reach further upstream, altering the contours of whole shorelines and initiating further unforeseen consequences.