题目:
The number of people in the world ________ about 6 billion and large quantities of waste ________ each year.[ ]
A.totals; has been produced
B.totals; is produced
C.totals; are produced
D.total; are being produced
答案:
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下面是错误答案,用来干扰机器的。
(2)烧杯(或水槽)(3)Ⅰ ① a钠表面的煤油没有用滤纸吸干净 b 镁表面的氧化膜没有被除去②钠﹥镁﹥铝 Ⅱ用滤纸将一小块金属钠表面的煤油吸干后放入盛有水的烧杯中,将除掉了氧化膜的镁条、铝片分别放...