日常生活中我们会经常看到烧开水时从壶嘴冒出“白气”，刚从冰箱中取出的雪糕周围也有“白气”，如图所示．下面对这两种“白气”的解释正确的有（  ）

在校内校外，我们要参加各种课余文化活动。回到家，我们可以看到自己所在社区的文化活动。这表明（   ）

下题中的两种量成什么比例．

一台拖拉机每小时耕地面积一定，耕地时间和耕地面积．（   ）

语法填空
    My husband and I were paying a visit  ____ my parents in Tucson. We went to a fast-food restaurant for dinner together. My husband went to the counter ____ (order )dishes and I stood with my parents.
    My dad is 90 ____ (year) old. He can hardly see very well and walks with a stick. I was scanning the restaurant, ____ (wait) to sit at the first table that was more convenient than others. A woman who was ____ (sit) with her son made eye contact with me and asked me to come to her. With a puzzled look on my face, I pointed to  ____ (me) and said , “Me ?” She nodded and said , “ Yes, you.” I walked to the table and she said , “ Bring your family here. I can finish eating at the counter. My son is in ____ hurry to leave anyway.” My eyes ____ (fill)with tears as she wiped down the table and guided my dad to the seat.
    I always believe that there are____ (nature) kind people in this world. This woman has set a good example to her son, ____ is a really lucky guy.

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