— Any advice about this trip?

— Well, no food is available on _____ island so make sure you bring _____ packed lunch and drink, as well as your camera and sunblock.

A．an, the

B．the; a

C．the; /

D．an; a

下列影响土地价格的经济因素中，具有不稳定、来得快去得快的特点的因素是( )。

A．利率水平
B．储蓄和投资水平
C．物价变动
D．不动产投机行为