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　　2.單選題

　　[填句補文]He has also included symbols to show which ions are nutrients， and which are common in soil or water. ________.

　　A、There have been many attempts to redesign the periodic table since Dmitri Mendeleev drew it up in 1871.

　　B、And the size of element‘s symbol reflects how much of it is found in the Earth’s crust.

　　C、Railsback has still ordered the elements according to the number of protons they have.

　　D、Raisback has listed some elements more than once.

　　正確答案：B

　　答案解析：空格前的這句話是圍繞symbol符號來講述的;選項B也是符號，即：元素符號的大小反映出它在地殼中被發現的量。

　　2.單選題

　　[填句補文]We all have our own comfort foods. Interestingly， they may vary according to moods and gender. One study found that happy people seem to want to eat things like pizza， while sad people prefer ice cream and cookies. __________ Researchers also found that guys seem to prefer hot， homemade comfort meals， like steaks and casseroles. Girls go for chocolate and ice cream.

　　A、Bored people crave salty， crunchy things， like chips.

　　B、Emotional eating patterns can be learned.

　　C、Don‘t let emotional eating disturb your weight.

　　D、But emotional eating can be linked to positive feelings too.

　　正確答案：A

　　答案解析：答案選A。空格前面的兩句話都是講不同的情緒者喜歡不同的食物，快樂的，悲傷的，而這句話所缺的也應該是情緒和食物有關的，縱覽各選項，很容易選出正確答案是A。

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