The country has sent up three manned spacecraft, the most recent ___ at the end of last March.

In China people usually eat ________ d

晚饭后，你散步时遇到你的一个朋友，你应说_________ 来打招呼。

It’s clever _____ you to help me work out this difficult maths problem. Thanks.— You are welcome. Now it’s easier ______ you to understand it.

下列古代文化常识不正确的一项是