It is calculated that there 1 a 25% rise in atmospheric contents of carbon dioxide since the beginning of the nineteenth century. The average temperature has 2 risen about half a degree Celsius. Most scientists agree that the greenhouse effect will raise average temperatures by roughly three degrees Celsius 3 the year 2050. Such an increase in temperature would melt parts of the polar ice caps, cause sea levels to rise, and inundate such places as the coastal towns in Florida and California . 4 , the corn belt and the cotton belt in middle-latitude United States would turn into vast deserts, 5 high-latitude areas such as Canada and Siberia would have the most pleasant climates. 1. (A) was (B) is (C) has been (D) would be 2. (A) reluctantly (B) increasingly (C) vigorously (D) correspondingly 3. (A) in (B) from (C) since (D) by 4. (A) Instead (B) In addition (C) In spite of (D) In so far as 5. (A) whereas (B) if (C) so (D) because 解析: 1. 本題考正確之動詞時態。由句尾的介系詞片語 "since the beginning of the nineteenth century" 「自從十九世紀初以來」可推斷,空格中應填入的是「現在完成式」之動詞形式,故正確答案為 (C) has been 。 2. 本題考適合修飾動詞之副詞。由前一句中提到的「大氣層中二氧化碳 (carbon dioxide) 的增加」及本句中提到的「平均溫度 (average temperature) 上升攝氏半度」來判斷,最適合用來修飾本句動詞 "(has) risen" 的應該是 (D) correspondingly ( 相對應地 ) 。 選項 (A) reluctantly 指「不情願地」,與題意無關;選項 (B) increasingly 指「逐漸增加地」,意義與 "rise"( 亦有【增加】之意 ) 重疊;選項 (C) vigorously 指「精力旺盛地」,亦與題意不搭軋。 3. 本題考正確之介系詞。由句意來推斷,科學家們都同意的應該是:「到」 2050 年時,溫室效應 (greenhouse effect) 會使平均溫度上升大約攝氏三度,而四個介系詞選項中能表達「到 ... 」這個意涵的是 (D) by 。 4. 前一句話提到的是:溫度的上升會使得極地的冰帽 (polar ice caps) 融化、海平面 (sea levels) 上升 、沿海城市被海水淹沒 (inundate) 。本句則 提到:美國位於中緯度 (middle-latitude) 的玉米帶 (corn belt) 與棉帶 (cotton belt) 會變成沙漠 ... 。二者間最合適的「啟承轉合」應該是 (B) In addition ( 此外 ) 。選項 (A) Instead ( 代替 ) 、 (C) In spite of ( 儘管 ) 、 (D) In so far as ( 到 ... 的程度 ) 皆不符題意所需。 5. 本句前一子句提到美國中緯度的玉米帶與棉花帶會變成沙 漠, 後一子句則提到加拿大與西伯利亞高緯度 (high-latitude) 的地區會有宜人的氣候 (pleasant climates) 。二子句之間最合理的聯結應該是 (A) whereas ( 然而 ) 。選項 (B) if ( 假如 ) 、 (C) so ( 所以 ) 、 (D) because ( 因為 ) 皆不符句意所需。 |