2. 外语
  3. California has more than two thousand【S1】______of plants that are not found anywhere else. A new study says climate change could

California has more than two thousand【S1】______of plants that are not found anywhere else. A new study says climate change could

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问题     California has more than two thousand【S1】______of plants that are not found anywhere else. A new study says climate change could severely【S2】______these plants by the end of the century. Many could move northward and toward the Pacific coast in reaction to rising temperatures and【S3】______in rainfall. Others might climb up mountains to find the cooler climates they like.
    But David Akeley at the University of California, Berkeley, says the【S4】______of climate change is greater than during ice ages in the past.  He says plants that cannot move fast enough are in
【S5】______of getting killed off before they can relocate. Changes in plants could also affect animals that depend on the plants for food.
    About forty percent of all【S6】______plants in California are endemic, meaning that they are found only in that state. The new study says that for two out of three endemic plants, the areas where they are found could【S7】_______ by more than eighty percent. That, they say, is the worst possible case.
    The researchers point out that there are many things they cannot be sure about. That【S8】______how much warming to expect in the future from【S9】______of heat-trapping greenhouse gases. Also, they cannot be sure what will happen to【S10】______species of plants.

    A)effect      I)includes
    B)speed       J)affect
    C)express     K)shrink
    D)kinds       L)sure
    E)types       M)release
    F)changes     N)species
    G)individual  O)native
    H)danger
【S8】
选项
答案I
解析 此空格填动词的第三人称单数形式。前句表明有很多事情他们不能肯定，后句则对此进行了解释，故选此答案。
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