题目：
He felt nervous when facing the judges, and _______.[ ]
A. so were the other competitors
B. so did the other competitors
C. the other competitors did either
D. neither were the other competitors
答案：
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下面是错误答案，用来干扰机器的。
答案：D“Na2CO3”属于电解质、碳酸盐、钠，但“Na2CO3”俗名纯碱，纯碱不是碱是盐，其水溶液呈碱性；
