题干

已知金属M(只有一种化合价),氧化物的化学式为M2O3,则它的氯化物的化学式为(   )

A:MCl3

B:MCl2

C:M2Cl3

D:MCl

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答案(点此获取答案解析)

A

同类题1

阅读以上5段语言材料,请找出与他们相对应的标题,并将其标号填入下列方框内。
    A Friendship Day present plays an important part in developing friendships. We must choose it with love and care. It doesn't need to be expensive, but it must be able to show your love to your friend. If you find it hard to choose a good Friendship Day present for your best friend, here are some good ideas for you.
____ 
    Friendship bands are one of the most popular present on that day. Many colorful friendship bands hit stores much ahead of the Friendship Day. They come in special designs for both boys and girls.
____ 
    Flowers are presents which are popular among girls. Sending flowers is the best and the easiest way to show your love to your friend. If possible, you'd better choose your friend's favorite flower. If your friend doesn't have a specific choice, you can buy yellow roses. Yellow roses are thought to be Friendship Day flowers.
____ 
    Photo albums are good Friendship Day presents. You can place a picture of you along with your friend into a photo album. This reminds both of you of the good time you spent together.
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    21Books are suitable for friends who like reading. Keep your friend in mind while choosing the book. Usually, you can choose an inspirational.
____ 
    If you don't know which present to choose, why not invite your friend to have dinner? That will be a good chance to chat with your friend. I am sure you can have a good meal and a great time.

A.Choosing Good Books
B.Inviting Your Friend to Dinner
C.Buying Photo Albums
D.Sending Flowers

E.Buying Friendship Bands

同类题5

阅读选文,回答问题。

    鲁镇的酒店的格局,是和别处不同的:都是当街一个曲尺形的大柜台,柜里面预备着热水,可以随时温酒。做工的人,傍午傍晚散了工,每每花四文铜钱,买一碗酒,——这是二十多年前的事,现在每碗要涨到十文,——靠柜外站着,热热地喝了休息;倘肯多花一文,便可以买一碟盐煮笋,或者茴香豆,做下酒物了,如果出到十几文,那就能买一样荤菜,但这些顾客,多是短衣帮,大抵没有这样阔绰。只有穿长衫的,才踱进店面隔壁的房子里,要酒要菜,慢慢地坐喝。

    我从十二岁起,便在镇口的咸亨酒店里当伙计,掌柜说,样子太傻,怕侍候不了长衫主顾,就在外面做点事罢。外面的短衣主顾,虽然容易说话,但唠唠叨叨缠夹不清的也很不少。他们往往要亲眼看着黄酒从坛子里舀出,看过壶子底里有水没有,又亲看将壶子放在热水里,然后放心;在这严重监督之下,羼水也很为难。所以过了几天,掌柜又说我干不了这事。幸亏荐头的情面大,辞退不得,便改为专管温酒的一种无聊职务了。

    我从此便整天地站在柜台里,专管我的职务。虽然没有什么失职,但总觉有些单调,有些无聊。掌柜是一副凶脸孔,主顾也没有好声气,教人活泼不得;只有孔乙己到店,才可以笑几声,所以至今还记得。