题干

小莉同学做“研究影响蒸发快慢的因素”实验,她在两块相同的玻璃片上分别滴上一滴水,如图所示.观察图中情景,可知小莉同学主要研究蒸发快慢是否与(   )

A:液体的温度有关

B:液体的表面积有关

C:液体上方的空气流速有关

D:液体的种类有关

上一题 下一题 0.0难度 选择题 更新时间:2018-04-06 09:53:04

答案(点此获取答案解析)

A

同类题3

阅读下面的文字,完成小题。

不明白

    ①整整的三年,他凑足了一百块钱!

    ②他不能再等了。原来的计划是买辆最完全最新式最可心的车,现在只好按着一百块钱说了。不能再等;万一出点什么事再丢失几块呢!恰巧有辆刚打好的车(定作而没钱取货的)跟他所期望的车差不甚多;本来值一百多,可是因为定钱放弃了,车铺愿意少要一点。祥子的脸通红,手哆嗦着,拍出九十六块钱来:“我要这辆车!”铺主打算挤到个整数,说了不知多少话,把他的车拉出去又拉进来,支开棚子,又放下,按按喇叭,每一个动作都伴着一大串最好的形容词:最后还在钢轮条上踢了两脚,“听听声儿吧,铃铛似的!拉去吧,你就是把车拉碎了,要是铜条软了一根,你拿回来,把它摔在我脸上!一百块,少一分咱们吹!”祥子把钱又数了一遍:“我要这辆车,九十六!”铺主知道是遇见了一个心眼的人,看看钱,看看祥子,叹了口气:“交个朋友,车算你的了;保六个月;除非你把大箱碰碎,我都自给修理;保单,拿着!”

    ③祥子的手哆嗦得更厉害了,揣起保单,拉起车,几乎要哭出来。拉到个僻静地方,细细端详自己的车,在漆板上试着照照自己的脸!越看越可爱,就是那不尽合自己的理想的地方也都可以原谅了,因为已经是自己的车了。把车看得似乎暂时可以休息会儿了,他坐在了水簸箕的新脚垫儿上,看着车把上的发亮的黄铜喇叭。他忽然想起来,今年是二十二岁,因为父母死得早,他忘了生日是在哪一天。自从到城里来,他没过一次生日。好吧,今天买上了新车,就算是生日吧,人的也是车的,好记,而且车既是自己的心血,简直没什么不可以把人与车算在一块的地方。

    ④怎样过这个“双寿”呢?祥子有主意:头一个买卖必须拉个穿得体面的人。最好是拉到前门,其次是东安市场。拉到了,他应当在最好的饭摊上吃顿饭,如热烧饼夹爆羊肉之类的东西。吃完,有好买卖呢就再拉一两个;没有呢,就收车:这是生日!

    ⑤自从有了这辆车,他的生活过得越来越起劲了。拉包月也好,拉散座也好,他天天用不若为“车份儿”着急,拉多少钱全是自己的。心里舒服,对人就更和气,买卖也就更顺心……

    ⑥因为高兴,胆子也就大起来;自从买了车,祥子跑得更快了。自己的车,当然格外小心,可是他看看自己,再看看自己的车,就觉得有些不是味儿,假若不快跑的话。

    ⑦他自己,自从到城里来,又长高了一寸多。他自己觉出来,仿佛还得往高里长呢。不错,他的皮肤与模样都更硬棒与固定了一些,而且上唇上已有了小小的胡子;可是他以为还应当再长高一些……  

    ⑧这么大的人,拉上那么美的车,他自己的车,弓子软得颤悠颤悠的,连车把都微微的动弹;车箱是那么亮,垫子是那么白,喇叭是那么响;跑得不快怎能对得起自己呢,怎能对得起那辆车呢?这一点不是虚荣心。而似乎是一种责任,非快跑,飞跑,不足以充分发挥自己的力量与车的优美。那辆车也真是可爱,拉过了半年来的,仿佛处处都有了知觉与感情,祥子的一扭腰,一蹲腿,或一直脊背,它都就马上应合着,给祥子以最顺心的帮助,他与它之间没有一点隔膜别扭的地方。赶到遇上地平人少的地方,祥子可以用一只手拢着把,微微轻响的皮轮像阵利飕的小风似的催着他跑,飞快而平穗。拉到了地点,祥子的衣裤都拧得出汗来,哗哗的,像刚从水盆里捞出来的。他感到疲乏,可是很痛快的,值得骄傲的,一种疲乏,如同骑着名马跑了几十里那样。

(选自老舍《骆驼祥子》,有删改。)

相关链接:《骆驼祥子》以20世纪初期北京动荡社会为背景,展现人力车夫祥子不幸的生活遭遇。祥子原是乡下农民,进城后当了人力车夫。他最大的愿望是拥有一辆属于自己的人力车。为了这个希望,他风里来,雨里去,拼命拉车,省吃俭用。

同类题4

任务型阅读

    Ways to Host an Eco-Friendly Cookout

    Eating in the open air may feel eco-friendly, but outdoor dining can result in unnecessary waste if you aren't careful.____If you keep that in mind throughout your preparations, you'll be off to a good start.

Reduce, Reuse, Recycle

    Skip the paper invitations and use online services like Email, or Facebook events____This way you'll avoid ending up with five different potato salads that go uneaten. Make it easy for guests to sort garbage by positioning different trashcans in a central location: one for kitchen garbage, one for recyclables, and one for non-recyclables.

Stop Using Plastic

    Plastic is a leading cause of litter and isn't easy to recycle. To make sure your cookout eco-friendly, consider some other options for making your cookout stand out. Use recycled jars as glasses. They're also far less breakable than regular glasses____ If guests know which glass is theirs, they don't need to reach for another one, which cuts down on the cleanup you'll be doing.

____

    Wherever possible, shop for local produce and goods to serve your guests. This will reduce your carbon footprint and help support your local economy. Buy produce and meats at your local farmers' market. Look for organic, but favor local over organic if you have to make a choice.

Use Renewable Light Sources

    ____ As the sun goes down, illuminate your party space with LED lighting and solar- powered decorations. Invest in some citronella (香茅精油) candles and torches to help drive away insects naturally.

A. Support Global Economy

B. Think Globally, Shop Locally

C. Ask guests to bring glasses of their own

D. Keep track of what everyone is bringing ahead of time

E. Save on energy by hosting your party during the daylight hours

F. One of the keys to being green is to reduce waste wherever possible

G. Put up some labels to the jars so people can write their names on them