题干

在含有酚酞的0.1mol/L氨水中加少量的NH4Cl晶体,则溶液颜色(    )

A:变蓝色

B:变深

C:变浅

D:不变

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答案(点此获取答案解析)

C

同类题1

阅读下文,回答相关问题。

                                                                                                                           父亲的眼神
        一个背影,让朱自清潸然泪下;一个眼神,让我终身悚然汗下。
        那是在我上中学时,因为有“瘸腿科”,加上当时传说文理不再分科,所以,尽管我的语文、英语成绩居班里前几名,但是数理化成绩却出奇的差。这样的情况下,肯定高考无望。因此,高一期末考试前,我彻底失望,回到家里。
        因自觉惭愧,回到家听说父亲正在田里拔草,我赶紧戴上草帽,到田里帮忙。学都上不好,再不勤快一点,会被人骂为“二流子”的。顶着烈日,到了田里,我告诉父亲,不想再上学,反正学不好了,还不如回家种田。
        我以为父亲会勃然大怒,他对我寄予很大的希望,当了一辈子的“睁眼瞎”,他不想我走他的老路。但是,父亲始终埋着头,并不理会我,好像并没有听进去我的话。我不怕父亲发火,却怕父亲的沉默。我不敢再说话了,只好随着他卖力地拔草。近晌午的太阳很毒,汗水在身上像虫一样爬,衣服贴在身上,抬起头,父亲仍然在埋头拔草,我怎好意思停下来……
        中午,回家吃过饭,父亲仍然没有就我退学的事发表意见。让我说什么好?情况很不妙,我知道,越是在闷热干燥的夏日午后,越会有突如其来的狂风暴雨。这沉默,让我忐忑不安。
        吃过饭,父亲说:“走吧,去地里把瓜秧翻一下,要不然今年地瓜就收不到了。”我拿起锄头就走。我就不信,父亲能干,我就不行。
        夏日午后的太阳实在太厉害,汗水把我弄得睁不开眼睛,要在学校,现在正是午睡的时侯,我早已经呵欠连天了——看父亲,光着黑黝黝的脊梁,仍在埋头翻秧——趁着父亲不注意,我跑到树阴底下枕着锄头就睡着了。
        好像没过多大一会儿,我就被父亲推醒。睁开眼,我看到父亲冷冷的眼神,那眼神很复杂,既有不屑、鄙夷,也有悲哀、绝望,还有许多我一下子说不出的内容……
        “当庄稼人你也不够格,躺在地头睡觉庄稼就会长出来?你那个样,二流子也比你强。你哄庄稼一天,庄稼就哄你一年。赶快起来!”
        父亲的眼神让我受不了,我的后脊早已经汗流下来了,不是热汗,是冷汗。
        当天晚上,回到家,我觉得浑身骨头都散了。摸着胳膊上已经晒脱了皮的地方,我的心乱成一锅粥。
        第二天早上,天刚蒙蒙亮,父亲又把我推起来。一睁眼,又是那眼神……我坐起来,恶狠狠地说了一句:“我要上学!”
        后来的事情变得很简单。高考后,我上了大学中文系。再后来,到电视台当上了一名记者。   
        尽管远离家乡,远离了父亲,但那眼神始终占据了我的记忆,回想起来就让我不忘。
        时至今日,我最喜欢的歌还是蔡琴《你的眼神》。这首歌的旋律很美,很忧郁,很沉静,很悠远,父亲的眼神不这样,但我想起来却抑制不住自己汹涌的感情。走到院子外,望着满天的繁星,我不由喃喃自语:“山一样沉默的父亲,我忘不了你的眼神!”
                                                                                                                                                                                                 (选自《青年博览》,有改动)

同类题4

Read the passage and fill in the blanks with the proper words(在短文的空格内填入适当的词,使其内容通顺,每空格限填一词,首字母已给)
    A thousand years ago, Hong Kong was covered by a thick forest. As more and more people came to live in Hong Kong, these trees were cut down and burnt. Now there is no forest left, though there are still some small areas covered with trees. We call these “woods”.
    Elephants, tigers and many o____  animals were living in the thick forest. When people came to live in Hong Kong, the animals began to die out. Early farmers grew rice and r____  pigs and chickens in the valleys. They cut down the trees and burnt them. They needed fire to keep t____  warm in winter, to cook their food and to drive away the dangerous animals. Elephants quickly d____  because there was not enough food for them. So did most of the wolves and tigers.
    You might think that there are no longer any animals in Hong Kong e____  in the zoos, but there are still about 36 different animals living there. One of the most lovely of Hong Kong's animals is the barking deer. There are beautiful little animals w____  a rich brown coat and a white patch under the tail. They look like deer but they are much smaller. They are less than two feet high. They make a noise rather like a dog barking. In Hong Kong the barking deer has only one r____  enemy- men. People hunt these little animals though it is illegal(犯法的). There are now not many barking deer left. So it is important for people to protect these wild animals.