--- A high-tech exhibition          in the National Museum.

--- Really? What about visiting it now?           .

A．will be held

B．is being held

C．is to be held

D．has been held

马歇尔稳定仪是用来测定沥青混凝土的（）。

A、和易性

B、热稳定性

C、力学性质

D、柔性