The price of the concert is too . I can't afford it.
A:expensive
B:high
C:cheap
D:dear
明朝抗倭名将是( )
将郡县制推广到全国和创设行省制的朝代分别是( )
下列4种育种方法中,变异类型相同的是( )
①用玉米花药离体培养得到单倍体植株;
②用秋水仙素处理西瓜幼苗得到多倍体植株;
③通过杂交育种获得抗病抗倒伏小麦品种;
④用X射线处理青霉菌得到高产菌株.