阅读理解。

     Apple trees may grow as tall as 12 metres and they grow best in areas that have cold winters. Although no

fruit is yielded during the winter, this cold period is good for the tree.

The underlined word " yielded" most probably means _____.

A. sold

B. bought

C. improved

D. produced

全国文昌庙的祖庭位于（）。

A.龙虎山

B.崂山

C.七曲山

D.齐云山