小明的父亲外出散步，从家走20分钟到离家900米的报亭看了10分钟报纸后，用10分钟返回家里，下面图形中表示小明的父亲离家的距离与时间之间的关系的图象是（   ）

动物细胞中的能量转换器是（  ）

阅读理解

    A popular saying goes, “Sticks and stones may break my bones, but words will never hurt me.” However, that's not really true. Words have the power to build us up or tear us down. It doesn't matter if the words come from someone else or ourselves — the positive and negative effects are just as lasting.

    We all talk to ourselves sometimes. We're usually too embarrassed to admit it, though. In fact, we really shouldn't be because more and more experts believe talking to ourselves out loud is a healthy habit.

    This “self-talk” helps us motivate ourselves, remember things, solve problems, and calm ourselves down. Be aware, though, that as much as 77% of self-talk tends to be negative. So in order to stay positive, we should only speak words of encouragement to ourselves. We should also be quick to give ourselves a pat on the back. The next time you finish a project, do well in a test, or finally clean your room, join me in saying “Good job!”

    Often, words come out of our mouths without us thinking about the effect they will have. But we should be aware that our words cause certain responses in others. For example, when returning an item to a store, we might use warm, friendly language during the exchange. And the clerk will probably respond in a similar manner. Or harsh (刻薄的) and critical language will most likely cause the clerk to be defensive.

    Words possess power because of their lasting effects. Many of us regret something we once said. And we remember unkind words said to us! Before speaking, we should always ask ourselves: Is it true? Is it loving? Is it needed? If what we want to say doesn't pass this test, then it's better left unsaid.

    Words possess power: both positive and negative. Those around us receive encouragement when we speak positively. We can offer hope, build self-esteem (自尊) and motivate others to do their best. Negative words destroy all those things. Will we use our words to hurt or to heal? The choice is ours.

文学作品阅读，完成各题。

旷野灯红(节选)

    ①我迷路了。

    ②发觉自己迷路了，我第一个反应便是惊惶。惊惶之后，那夜里的声响便更怪异、更刺耳，且纷繁杂沓。

    ③于是，脚跟踩不踏实，趔趄不止，跌倒趴下便是自然的事。

    ④很想躺下去，但又忍不得夜幕里这一种莫名的屈辱，便带着浑身的创痛，朝无边的幽暗跌撞而去。

    ⑤“路总有走到头的时候。”我心里说。但路愈走愈陡了，树木也愈来愈稀疏。凭着爬山的经验，我知道已攀上了相当的高度，不能再贸然走下去了，否则弄不好会跌到深渊里，做一无谓的少年鬼。站在那里，我很想走下去，却不能再走下去，那是一种什么样的人生境界呢?是一种绝望的心境吧!

    ⑥泪，无声地落下来。但在泪眼的一片模糊中，我却发现右前方有一线隐约的微光，泪竟倏地止住了。揉一揉眼再看，那一线微光依然时隐时现。抽紧的那颗心便松开一道缝。我朝着那个方向摸索而去，心中再无一丝犹豫。爬了一段坡以后，那线光便成了清晰的一团一可以确认，那是一扇不眠的窗。心霍地释然了，这时，光明是驱赶绝望唯一的鞭子。

    ⑦到了跟前，是一座孤零零的小屋。敲一敲门，门竟悄然自开。灯下，一个满头白发的老婆婆安详地躺在床上。她的眼皮动了两下，分明已知道夜客到来，却不说话。

    ⑧“婆婆，我迷路了。”我告诉她。

    ⑨“哦。”她只欠了欠身，  “坐吧，我眼睛不好，看不见你。”

    ⑩我愣了一下，依旧站着。

    ⑪“孩子，你要去哪儿呢?”她有气无力地问。

    ⑫我报了我要去的那个村子。

    ⑬她长长地“哦”了一声，坐起身来，说：  “到底是个孩子啊，应该爬西边那座山，却爬到东边来了。白天，在日头下，也要爬半晌呢。”

    ⑭在灯光下，虽然知道自己走了好长好长的冤枉路，我却没有一丝惋惜，竞“咯咯”笑起来。我此时的感觉很奇异，似从娘怀里走散的孩子，又回到娘怀里一样，失散的痛苦已全然忘却了。

    ⑮交谈之后，知晓这瞎眼婆婆是个五保户，山下的人白天上来转一遭，看她柴米不缺、安然无恙，便又不停留地下去了。漫漫长夜，是独属于瞎眼婆婆的。

    ⑯“您什么也看不见，为什么还要整夜点灯呢?”

    ⑰“为什么?灯亮着，野兽不敢来，夜盗不敢来，灯是瞎子的眼哩。”

    ⑱“瞎子的眼?”我惊叫道。

    ⑲那一夜，我住在了她那里。

    ⑳我有时想，在那漫长而孤寂的长夜，瞎眼婆婆与灯独对，真的是为自己再长一只眼吗?

    这是一个真实的故事。

    旷野中，一盏点亮的灯对人是多么重要啊——它是生命存在的证明。

 (摘自《读者》，有删改)