有助于前列腺癌诊断的指标是（）。
A.癌胚抗原升高
B.甲胎蛋白升高
C.碱性磷酸酶升高
D.淀粉酶升高
E.前列腺特异性抗原升高
参考答案：E
The earliest English ___ was written in a kind of English that is now difficult ___.
A．poem; to understand
B．poet; to be understood
C．poetry; to be understand
D．poetry; to understand
