甲、乙两台机床在相同的条件下同时生产一种零件，现在从中各抽测10个，它们的尺寸分别为（单位：mm）：

甲：10.2  10.1  10.9  8.9  9.9  10.3  9.7  10  9.9  10.1

乙：10.3  10.4  9.6  9.9  10.1  10  9.8  9.7  10.2  10

分别计算上面两个样本的平均数与方差，如果图纸上的设计尺寸为10 mm，从计算结果看，用哪台机床加工这种零件较合适？

—Your spoken English is much better now.

—Thank you. Our English teacher often asks me_______English as_______as I can.

A．to speak, many

B．not to speak, many

C．to speak, much

D．not to speak, much