月经先期属于以周期异常为主的月经病，既往亦称其为（）
A.经水不及期
B.经期超前
C.经早
D.经乱
E.月经愆期
参考答案：A, B, C
In order to keep fit, people eat ________ vegetables per person today as they did two years ago.
A．as many twice
B．twice more than
C．twice as many
D．more than twice
现金股息在除息日直接计人基金收益。 （ ）
