--What do you think of _____talk he gave us yesterday?

--Wonderful. I've never heard _____ better one.

A．the, a

B．a, the

C．the, the

D．a, a

创制眼镜的科学家是（）

A、英国、牛顿

B、英国、托马斯•扬

C、荷兰、惠更斯

D、中国、孙云球