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14儿童在能说或能听懂语言之前，很久就会通过面部表情和靠发出噪声来与人交流了。r
15Tha
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15受当代灌溉技术设施之赐，农作物在原来只有仙人掌和荞属科植物才能生存的地方旺盛的生长。r
16Thedevelopme
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16机械计时器的发展促使人们寻求更精确的日晷，以便校准机械计时器。r
17A
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17人类学是一门科学，因为人类学家采用一整套强有力的方法和技术来记录观测结果，而这样记录下来的观测结果是供他人核查的。r
18Fu
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18真菌在腐化过程中十分重要，而腐化过程将化学物质回馈于土壤，提高其肥力，并分解动物粪便。r
19Whe
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19音叉被敲击时，产生几乎纯质的音调，其音量经久不衰。r
20Althoughpeca
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20虽然美洲山河桃树最集中于美国的东南部但是在北至俄亥俄州及伊利诺州也能看见它们。r
21Elimi
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21用怪罪别人的办法来解决问题通常被称为寻找替罪羊。r
22Thechieffoodseate
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22一个国家的主要食物是什么，大体取决于什么作物在其天气和土壤条件下生长得最好。r
23Overaverylarge
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23在大量的实验中，某一事件发生的几率等于它不发生的几率。r
24Mostsubsta
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24大多数物质遇冷收缩，所以他们的密度在固态时高于液态。r
25Themecha
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25大脑细胞储存记忆的机理并不为人明白。r
26Bythemiddleofthetwe
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