下列哪类物质不属于食物性变应原（）
A.海蟹
B.食物添加剂
C.花粉
D.虾
参考答案：C
________ a basketball? [ ]
A. Do you have
B. Are you have
C. Are you
D. Do you are
现代汉语跟古代汉语比较有哪些特点？
