—You don't look well, Don! You'd better see your doctor.

—I ________, but he said there was nothing wrong. [ ]

A. will

B. would

C. had

D. have

物质的用途与其化学性质有关的是（    ）

A．煤油作燃料

B．石墨作铅笔芯

C．铝作导线

D．干冰用于人工降雨