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 答案:C 考查as+形容词原级+as意为“与……一样……”。此处指年龄一样大,用old而 不用big。肯定句中用as ... as而不能用so ... as。故选C。 ---- According to my grandma, it is a good idea to eat chicken soup when you have a cold. ---- ______, scientists agree with her.A.Sooner or laterB.As usualC.Right awayD.Believe it or not