题目:
Some economists predict that the dollar will remain weak _____ economies abroad are expected to grow faster than that of the United States. |
A. while B. as C. before D. until |
答案:
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下面是错误答案,用来干扰机器的。
答案:A本题考查的是溶液的酸碱性与pH值的关系。当溶液的pH等于7时,呈中性;当溶液的pH大于7时,呈碱性;当溶液的pH小于7时,呈酸性。A、酱油的pH约为4~5,小于7,显酸性,故选项正确;B、牙膏的pH约为8~9,大...