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　　2.单选题

　　[填句补文]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.

　　正确答案：B

　　答案解析：空格前的这句话是围绕symbol符号来讲述的;选项B也是符号，即：元素符号的大小反映出它在地壳中被发现的量。

　　2.单选题

　　[填句补文]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.

　　正确答案：A

　　答案解析：答案选A。空格前面的两句话都是讲不同的情绪者喜欢不同的食物，快乐的，悲伤的，而这句话所缺的也应该是情绪和食物有关的，纵览各选项，很容易选出正确答案是A。

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