7.The continental ice sheet is more than two miles high at its center; thus， the air over the Antarctic is far more refrigerated than it is over the Arctic regions. This cold air cascades off the land with such that it makes the nearby seas the stormiest in the world and renders unlivable those regions whose counterparts at the opposite end of the globe are inhabited.
［A］ force
［B］ roughness
［C］ influence
［D］ coldness
解析：cascade 本意指“瀑布般地流下，瀉下”，這里就是指冷空氣來勢兇猛，力量很大，所以正確答案是 force。
8.But at the beginning of this century， the tango was refined， so that it lost its erotic features. It was preformed in fashionable casino ballrooms. The tango， in its sophisticated European ， became popular in England and in the USA.
［A］ shape
［B］ form
［C］ format
［D］ contour
解析：根 據(jù)上下 文辨別 詞意： ［A］ shape“外形 ，形狀 ”; ［B］ form“形 式，種 類”;［C］format“樣式”;［D］ contour“輪廓，外形”。顯然，正確的選項是［B］。
1.According to a recent survey， Americans also change their eating patterns to meet the needs of different situations. They have certain ideas about which foods will make them __for business meetings， or put them in the mood for romance.
［A］ attentive
［B］ shrewd
［C］ acute
［D］ alert
解析：alert 表示思維敏銳，思想高度集中，能注視周圍發(fā)生的一切。［A］attentive只是集中精力;［B］shrewd“（生意人）精明的”;［C］acute“尖銳的，鋒利的”。
2. _ some aspects of language are undeniably innate， language does not develop automatically in a vacuum. Children who have been isolated from other human beings do not possess language. This demonstrates that interaction with other human beings in necessary for proper language development.
［A］ Because
［B］ In case
［C］ Although
［D］ Whether
解析：從句“語言的某些方面毫無疑問是先天的”與主句“語言不會… …自行發(fā)展”在邏輯 上是 矛盾 的， 故應 選 表示 轉(zhuǎn)折 關系 的連 詞 Although （盡 管， 雖然 ）A］Because 表因果關系;［B］ In case“萬 一， 一旦 ”，引 導 條件 從句 ;［D］Whether“無論是否”。