克星，前述例子中考的是“currently”而不是考 “should、could”，在应试时更要小心。

        4、“似是而非，半段正确”最可怕

        我们先来看看1998年的一道真题：

        Which of the following is true according to the passage?

        {A} Environmentalists were blamed for antiscience in an essay.

        {B} Politicians are not subject to the labeling of antiscience.

        {C} The "more enlightened" tend to tag others as antiscience.

        {D} Tagging environmentalists as "anti science" is justifiable.

        这是一道设计非常巧妙的考题，据说当年答对本题的考生不到5%，因为这道题考了太多的细节，而且每一个选项都有似曾相识的感觉，更何况本题如果以中心思想来判断的话是非常难的，因为选项中本身就暗藏着陷阱。本题的直接依据是文中的这样一句话：But surely that does not mean environmentalists concerned about uncontrolled industrial growth are antiscience, as an essay is US News & World Report last May seemed to suggest。

        这里提醒所有考生注意一点：当你感觉到每一个选项似乎都对、都不对的时候千万要回头再看看那些你认为一定不正确的选项，也许一个小小的留意就可以让你轻易拿到两分，而且是和别人拉开差距的两分。本题的关键是A项中的短语in an essay，这个隐藏在角落里的 小东西直接决定了答案是A。

        5、我们再来看看1992年的一道真题：

        It can be concluded that a concentration of carbon dioxide in the atmosphere would ____.

       {A} prevent the sun's rays from reaching the earth's surface

       {B} mean a warming up in the Arctic

       {C} account for great changes in the climate in the northern hemisphere

       {D} raise the temperature of the earth's surface

        本题的答案是D,尽管D看起来太短了一点太直接了一点，这一点令许多大师高手认为的答案应当复杂化深刻化的感觉不快。我们现在看看为什么C不对，因为C也有直接依据：Also, the increase in atmospheric would lead to great changes in the climate of the northern hemisphere, possible resulting in an alteration of the earth's chief food-growing zones。因为 carbon dioxide导致raise the temperature of the earth's surface，那当然也可能导致great changes in the climate。也就是说单单从短文的角度来说选项C是正确的，不过短文中的great changes in the climate却是未来的推测，不是现时的影响，所以选项C是一个似是而非不符合题意的选项，错。

责任编辑:zhaotingting