Helen is 15 years old, and Joan is 15, too. So Helen is________Joan.

A．as big as

B．as older as

C．as old as

D．so old as

下列关于患者对于极冷情况下感觉的发展顺序中，正确的是（）

A.麻木-冷-烧灼-痛

B.冷-烧灼-痛-麻木

C.痛-冷-烧灼-麻木

D.冷-麻木-烧灼-痛

E.冷-痛-烧灼-麻木