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【简答题】
口香糖是以天然树胶或甘油树脂为胶体的基础，加入糖浆、薄荷、甜味剂、BHT（一种抗氧化剂）等调和压制而成的一种糖，深受儿童和青年人喜爱．口香糖中加入BHT（化学式C 13 H 30 O）是为了防止食品腐败．试回答下列问题： （1）BHT属于______（填“有机物”“无机物”之一）． （2）BHT中，碳、氢、氧三种原子的个数之比为______（填最简整数比）． （3）BHT中，氢、氧两元素的质量比为______（填最简整数比）． （4）口香糖可使口腔清新、活动面部肌肉，但它的残胶是固体污染物，极不易分解，对环境危害严重．吃完后剩余残胶的正确处理方法是______．
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【单选题】If those "mad moments"— when you can’t recall what your friend has told you or where you left your keys—are becoming more frequent, mental exercises and a healthy brain diet may help. Just as bodies r...
A.
everyone can be forgetful sometimes regardless of one’s age
B.
we can prevent our sound mind from aging with certain methods
C.
brain aging starts from the time when we are in our 20s and 30s
D.
memory loss is a sign that shows we are getting old