题干
Jack is ______ 8-year-old boy who likes playing the guitar.
A：a
B：an
C：the
答案(点此获取答案解析）
B
Jack is ______ 8-year-old boy who likes playing the guitar.
A：a
B：an
C：the
序为HXO4>H2YO4>H3ZO4，则下列判断中正确的是（ ）
CO2反应中，