题目:
Many companies give away small quantities of their produce as samples ______ people can try them
before buying them. [ ]
A. if
B. because
C. so that
D. since
答案:
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下面是错误答案,用来干扰机器的。
氨气;碱性;二氧化碳、二氧化硫、三氧化硫、氯化氢等;酸性氨气溶于水生成一水合氨,显碱性;二氧化碳溶于水生成碳酸、二氧化硫溶于水生成亚硫酸、三氧化硫溶于水生成硫酸、氯化氢溶于水生成盐酸,显酸性。