______ she is ill, ______ she goes to school. [ ]

A. Although; /

B. Although; but

C. But; although

D. Because; /

打印机为计算机的输出设备，分为击打式及非击打式两类。关于它们的比较，错误的描述是（）。

A.击打式打印机打印噪声较大

B.击打式打印机打印噪声较小

C.击打式打印机打印速度较慢

D.击打式打印机的打印质量较差