题干

小伟是七年级学生,他的爷爷经常早晨到千佛山的树林丛中锻炼,并且说是有利于呼吸新鲜空气,但小伟上完一节生物课后,劝告爷爷早晨的时候最好不要到树木茂盛的地方去,你知道他当时学的哪节课吗?(   )。

A:绿色植物的蒸腾作用

B:绿色植物的呼吸作用

C:植物的主要类群

D:生物体的结构层次

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答案(点此获取答案解析)

B

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    The day finally came,when I had to leave the warm home where I'd grown up.I ran to the back yard,as tears came up from my heart.Suddenly I1a hand rest on my shoulder.I looked up to2mygrandfather.“It isn't3,isit,Billy?”he said softly.

    Gently4myhand in his,we walked,hand in hand,tothe front yard,5a hugered rose­bush sat alone.

    “What do you see here,Billy?” he asked.I looked at the flowers,not knowing6to say,and then answered,“I see something soft and7,grandpa.”

    He pulled me8.“It isn't just the roses that are beautiful,Billy.It's that special place in your heart that makes them so.”“Billy,I9these roses when my first son was born.It was my10of saying 'thank you' to God.I11to watch him pick roses for his mother. Then, as a young man of only 20,a terrible war robbed him of his life.” Grandpa slowly stood up.“Never say good­bye,Billy. Never12to the sadness and the loneliness.Instead,I want you to remember the joy and the13when you first said hello to a friend.”

    A year later,my grandpa became very14.Then all members of the family were15back,and I returned to the old house. When it came to my16,I took his hand as17as  he had once taken mine.

    “Hello,grandpa,”I18.His eyes slowly opened and said,“Hello,my friend.” With a brief19he died. Suddenly,and truly.I knew what he had20about never saying good­bye—about refusing to give in to sadness.