答案　D

　　19．A.sign B．sigh

　　C．smile D．wave

　　解析　此处应指祖父和“我”说完话之后是含笑而终。smile符合语境。

　　答案　C

　　20．A.thought B．meant

　　C．worried D．cared

　　解析　此处是指突然“我”真正明白了祖父曾经说的关于“永远不要说再见”的含义。

　　答案　B

　　三、阅读理解

　　A

　　Does stress cause gray hair？Many people believe that tension and stress can cause your hair to lose its color.In fact，it is an_old_wives’_tale that being upset all the time can result in premature graying.Here is a closer look at this situation and why some believe that this old wives’ tale could be true.

　　As one ages，the hairs on the head also age.In fact，just about everything on the human body begins to show signs of wear and tear after a while.The joints wear and become stiff and skin wears and becomes wrinkled.Hairs on the head grow and eventually die.They are replaced，but in the process something else happens.

　　When new hairs are replaced，the color or pigment (色素) is also added to them.However，as one ages，this pigment becomes less and less available.At first，hairs will have a limited amount of pigment and they will appear to be grayish in color.In time，they will lose all of their pigment and will be white.Many things are known to cause graying，and genetics is a very powerful factor.If one of your parents turns gray at an early age，there is a good chance that you will too.Some people begin the graying process in high school，while others may be over the age of forty.

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