已知集合M={2，5，8}，N={5，8，9，10}，则M∪N=（　　）

A．{2，5，8，9，10}

B．{5，8}

C．{9，10}

D．{2}

In order to let more people pay attention to their plan, they _________ some signs on the wall.

A．put on

B．put up

C．set up

D．give up