题干

如图所示是常见的物态变化现象,其中需要吸热的是(  )

A:樟脑丸逐渐变小

B:河水结冰

C:露珠的形成

D:“雾凇”的形成

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答案(点此获取答案解析)

A

同类题1

阅读下面的文字,完成下列各题。

马罗大叔(节选)

陈忠实

    饥饿像洪水猛兽一样咬噬着我的心!

    我走出门,村巷里死一般沉寂。没有月亮的秋夜,田野里一片黑暗。正在孕穗的包谷林里,散发着一股浓郁的包谷棒子的腻腻的甜香气味,我在水渠边站住了。

    我伸手摸到一根包谷杆子,掰下一个又肥又粗的棒子,三两把撕掉嫩皮,蹲在水渠沿儿上啃起来。包谷粒儿里的乳汁竟然溅到眼睛里,我一定是啃得太猛太快了。嫩包谷粒儿在嘴里,还没有来得及嚼烂,就滚进肚子里去了,几乎尝不出什味,只觉得十分香甜。

    我把啃光了的包谷芯子丢到水渠里,再伸手摸到又一个包谷棒子,却猛然看见一个人,正站在三五步远的大柳树下。我一惊,一愣,从身影和体形上,立刻辨认出来,那是马罗儿,终年四季给生产队看守庄稼的老光棍儿。我也不知凭什么勇气,没有撒腿逃遁,也没有向他求饶,而是毫不动摇地把那个已经抓摸到手的包谷棒子,“咔嚓”一声掰了下来,三两下撕开嫩皮,蹲下身,又啃起来了。

    “哼!你倒胆大——”他冷笑着说。

    “跟我走!”马罗吼着。

    顺着水渠往东走,我就看见一盏马灯萤萤的亮光,那马灯正挂在老光棍住的庵棚上。

    “坐下!”他的头一摆,对我吼喊。

    “啊……嗨嗨嗨嗨嗨……”

    突然间,他放声大哭起来,那粗哑的男人的哭声,从他喉咙里奔泻出来。像小河在夏季里突然暴发山洪,挟裹着泥沙、石头和树枝,带着吼声,颤动着四野。马罗伸出双臂,把我抱住,硕大的脑袋压在我的胸膛上,哭得更加不可收拾。他粗壮的身体颤抖着,两条铁钳一样的手臂夹得我的肩胛骨麻辣辣地疼了。

    松开抱着我的手臂,他哭溜着声儿颤颤地说了一句:“咱们……好苦哇……”

    我再也支撑不住了,心酸了,腿软了,一下子坐在茅草庵棚门口的树根上,双手捂住脸颊,哭起来了。

    老光棍马罗,像疯了似地在庵棚前的草地上,跳起又落下,破口大骂:“你他妈的……假积极!你欺哄毛主席,放你妈的臭……卫星!你得了奖状,叫俺社员跟受洋罪——啃生包谷棒子!”

    戒备,羞愧,所有这些复杂的心情,全都随着马罗的骂声跑掉了。马罗蹦着,骂着,声音渐渐远了,钻进包谷地里去了,随之传出咔嚓咔嚓的断裂的脆响。

    他怀里抱着一撂包谷棒子,扔到庵棚口的草地上,点燃麦草,再加上树枝,火苗哧哧哧蹿起来,冒得老高,在一个用铁丝扭成的支架上,摆上了嫩包谷棒子。他咕哝咕哝地说:“咋说也不能……啃生的……”

    干透的树枝燃烧起来,噼啪作响,火声是这样富于生气。我坐在火堆旁,看火苗忽而落下又忽而蹿高,在秋夜的黑幕中辟开的光亮的空间,随着火苗的起落忽而缩收又忽而扩大。火苗在树枝上跳跃,从燃烧着的枝条上攀援到刚添加上去的树枝上,像万千猕猴在树林里嬉闹,跳跃翻跌;无数条火苗拢在一起,就组成一个火的世界,充满了活力

    马罗大叔坐在一块河卵石上,两手搭在撇开的膝头上,挺直腰板,俨然一副用斧头砍削出来的青石雕像。火光映照着他的脸,一会儿明亮,一忽儿灰暗,四方脸中央,雄踞着一宽大的蒜头鼻子,脸颊上有两道粗糙的大动脉似的皱纹。这张脸上,现在呈现出安详的神态,专注的眼神。他间或用右手里的树枝拨弄一下火堆里的柴枝,甚至歪一歪脑袋,向火堆里吹两口气,然后又坐直了,却不开口说话。

    “吃——熟咧。”

    他从火堆里的铁丝架上取出一个包谷棒子,甩过来,撂到我的怀里。一股热气饱溶着浓烈的香甜气味扑鼻而来。软软乎乎的包谷粒儿,酥软香甜,一口咬进嘴里,我的眼泪禁不住扑洒下来了

    那晚我没有回家,和马罗大叔挤睡在他的庵棚里的吊床上。

(选自《陈忠实文集》)

同类题5

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    Leaving Hanoi on a fiercely hot summer day,after an hour by air,Luang Prabang gradually appears below our airplane wings.From a few hundred meters above,my first impression of this UNESCO-listed heritage(遗产)is an area of green land and mountains,surrounded by snaking rivers.

    Encircled by mountains,the former royal capital of Luang Prabang is more than just the country's picture-perfect showpiece.

    Travelers will be attracted to Luang Prabang by the city's timeless peacefulness with its shiny Buddhist temples, French colonial architecture and friendly people.

    Tourists visiting Luang Prabang shouldn't miss the chance to see one of the most sacred(神圣的)Lao traditions, tak bat,or the Buddhist almsgiving ritual(仪式),which dates back to the 14th century.

    As the sun rises in Luang Prabang,hundreds of Buddhist monks depart from their temples to gather their daily offerings,which most commonly are rice,fresh fruit and traditional sweet snacks.The daily alms gathering begins on the main street before spreading to all the side streets.

    Our group of six got out of our comfy beds at 5 am to join other local residents and tourists to offer alms to the monks.We kneeled by the roadside in front of the 3 Nagas Hotel on the main street with big baskets of steamed sticky rice,waiting quietly until monks of all ages passed by to accept our gifts.

    The daily ritual gives you a wonderful opportunity to experience an ancient Lao tradition.However,there are some strict rules if you wish to join the event.

    Firstly,shoulders,chests and legs must be covered in modest clothing as a mark of respect.You should also remain a suitable distance from the monks.Photographs may be taken,but from a distance and never use a camera flash.The ritual has to be performed in silence.Talking to or touching the monks at any time,even when making an offering,is not allowed.

    Another must-do morning activity is to visit the local market,where you can see the generosity that Mother Nature offers this dreamy land.While walking through the morning market,located within a long and narrow hamlet,I was excited to see all kinds of products from the nearby river and jungle: some ill-fated squirrels lying next to fresh bamboo shoots,different kinds of wild mushrooms and vegetables displayed on banana leaves and giant river catfish in baskets.

    Although Luang Prabang is small,there are many things to see here.Active travelers can get up close and personal with Laos' gentle giants at the elephant conservation camp or take in some scenes of riverside life with a cruise or kayak excursion on the rivers.Two waterfalls that are perfect for picnicking in the foothills nearby,and classes are available in traditional crafts.