分析 當天氣炎熱時,你去湖邊或海邊,當你靠近湖或海邊時,你感覺很涼爽.為什么?太陽使地球變熱,但它不能讓水變熱.雖然地表上空的空氣變熱,但是水面上方的空氣并不熱.地表上方的熱空氣上升,然后水上的冷空氣移動并取代地表上方的熱空氣.當你在湖或海洋附近,冷空氣移動的時候你會感覺到它.你感覺到風,而且風使你感覺涼爽.
當然,科學家不能回答我們所有的問題.如果我們問"為什么海洋里充滿了鹽?"科學家會說鹽來自于巖石.當巖石變得非常熱或非常涼時,它就會裂開,雨水就會落入裂縫.雨水就會把鹽帶入地表和河流.河流攜帶鹽進入海洋.然后我們問"海洋中的鹽發(fā)生了什么?海洋不會變得更咸."科學家們不確定這個問題的答案.
關于我們的世界我們知道很多.但對許多問題我們都沒有答案,我們很好奇.
解答 66-70 BABDB
66.B.文章主旨題.根據全文的內容,主要講述的內容是關于海洋的一些知識,其中有些問題科學家能夠幫我們解決,有些科學家不能解決,也就是scientists can explain many things,but not everything,科學家能給我們解釋很多問題,但是并不能解決我們的所有問題.
67.A.細節(jié)理解題.根據When you are near a lake or an ocean,you feel cool.Why?The sun makes the earth hot but it can not make the water very hot.Although the air over the earth becomes hot,the air over the water stays cool.The hot air over the earth goes up.Then the cool air over the water moves in and takes the place of the hot air.When it moves in,you feel the wind.And the wind makes you cool.太陽使地球變熱,但它不能讓水變熱.雖然地表上空的空氣變熱,但是水面上方的空氣并不熱.地表上方的熱空氣上升,然后水上的冷空氣移動并取代地表上方的熱空氣.當你在湖或海洋附近,冷空氣移動的時候你會感覺到它.你感覺到風,而且風使你感覺涼爽.所以現(xiàn)在科學家已經知道在夏天人們在湖邊或海邊感到涼爽的原因.故選A.
68.B.細節(jié)理解題.根據When a rock gets very hot or very cool,it cracks(崩裂),and rain falls into the cracks.可知,當巖石太熱或太涼時均會導致其崩裂,因此答案為B.
69.D.詞義推斷題.根據When you are near a lake or an ocean,you feel the cool air when it moves in.You feel the wind and the wind makes you cool.可知,當它移動的時候你會感覺到他,而再根據上一句The hot air over the earth goes up,then the cool air over the water moves in and takes the place of the hot air.地表上方的熱空氣上升,然后水上的冷空氣移動并取代地表上方的熱空氣.因此這里的它,即it指代的是水面上方的冷空氣,即the cool air over the water.
70.B.推理判斷題.關于A選項的問題,The reason why people feel cool when they are near a lake or an ocean in hot weather.文中已經給出了解釋"The sun makes the earth hot,but it can not make the water hot.Though the air over the earth becomes hot,the air over the water stays cool.The hot air over the earth goes up,then the cool air over the water moves in and takes the place of the hot air.When you are near a lake or an ocean,you feel the cool air when it moves in.You feel the wind and the wind makes you cool."A正確;關于The reason why the ocean doesn't get saltier every year.這個問題,文中已經指明,科學家不能給我們答案,But then we ask"What happens to the salt in the ocean?The ocean does not saltier every year."scientists are not sure about the answer to the question.,因此B錯誤;The reason why the water in the ocean is salty.這個問題的答案文中也已經指明,是由于巖石在過熱或過冷的條件下會崩裂,雨水將鹽帶入河流,最終匯入海洋,C正確;The reason why rocks crack.文中也已指明原因,When a rock gets very hot or very cold,it cracks 當巖石太熱或太涼時均會導致其崩裂;故D對.故選B
點評 本文旨在介紹海洋相關的知識,從而引出我們迫切希望了解我們生存的環(huán)境.做題時要在理解好文意的基礎上,與題目有機的結合,從文章中找到相關細節(jié)性的句子與選項細細比對,進行選擇和推理判斷選出符合文章內容的正確選項.做題注意靈活,有時可采用排除法或直選法確定出最終答案.
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