A report says school maths standards in England have failed to improve in the last 30 years, ______ than those in mid-1970’s, when only 20% of the students could pass maths exams.

A．no better

B．not better

C．no worse

D．not worse

当代世界各国的国家结构形式分为哪两种形式（）

A.联邦制和邦联制

B.单一制和复合制

C.总统制和议会制

D.民主共和制和君主立宪制