铸铁焊补主要用于（）。 A.麻口铸铁 B.白口铸铁 C.灰口铸铁

阅读下文并回答问题。

Good afternoon! Welcome to England .  We  hope that your visit here will be a pleasant one. Now, I would like to tell you something about our laws.

The first one is about drinking. Now, you may not buy wine in the country if you are under 18 years of age, nor may your friends buy it for you.

The second one: noise. Enjoy yourselves by all means, but please don’t make unnecessary noise, especially at night. We ask you to respect other people who may wish to be quiet.

The third one: crossing the road. Be careful. The traffic moves on the left side of the road in the country. Use pedestrian crossings(人行横道) and do not take any chances when crossing the road.

My next point is about rubbish. It isn’t lawful to drop rubbish in the street. When you have something to throw away, please put it in your pocket and take it home, or put it in a dustbin.

Finally: smoking. It is against the law to buy cigarettes or tobaccos if you are under 16 years of age.

I’d like to finish by saying that if you need any kind of help, you can contact the police. The police will be pleased to help you. You can call, write or directly go to ask any policeman.

According to the passage, answer the following questions:

小题1:How many points are discussed in the speech?

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小题2:How can you contact a policeman if you need help?

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小题3:Can you buy cigarettes if you are under 16 years of age?

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在下列所述的物体的运动情况中，不可能出现的是（　　）

A．物体在某一时间速度很大，而加速度为零

B．物体在某一时间速度很小，而加速度很大

C．运动的物体在某一时刻速度为零，而加速度不为零

D．做变速直线运动的物体，加速度的方向与运动的方向相反，它的速度在增大

第二产程停滞

单核细胞与粒细胞起源于共同的（）细胞，在骨髓内经（）、（）发育成为成熟单核细胞，释入血流。

材料一绘画之学，为各学之本，国人视为无用。岂知一切工商之品，文明（意为文治教化）之具，皆赖画以发明之。……若画不精，则工品拙劣，难于销流，而理财无从始也。文明之具，亦立国所同竞，而不可以质野立于新世互争之时者也。故画学不可不至精也。——摘编自康有为《物质救国论》材料二中国近世之画衰败极矣，盖由画论之谬也。……然则画以象形类物……非取神即可弃形，更非写意即可忘形也。……今特矫正之：以形神为主而不取写意，以着色界画（指古代宫廷画）为正，而以墨笔粗简者为别派（即旁支）；士气固可贵，而以院体（指宫廷画）为画正法……中国画学至国朝而衰弊极矣……枯笔数笔，味同嚼蜡，岂复能传后，以与今欧美日本竞胜哉？……如仍守旧不变，则中国画学应遂灭绝。国人岂无英绝之士应运而兴，合中西而为画学新纪元者。——康有为《万木草堂藏画目》材料三画师吾爱拉飞尔，创写阴阳妙逼真。色外生香绕隐秀，意中飞动更如神……拉飞尔画非人力，秀韵神光属化工。太白诗词右军字，天然清水出芙蓉。（注：拉飞尔，又译为拉斐尔，意大利文艺复兴时期的画家；右军，指王羲之）——康有为《怀拉飞尔画师得绝句八》材料四康氏不谙中西绘画，主以院画（指中国古代宫廷画）为绘画正宗，全是以个人意志而加以论断者。恐与其政见之由维新而至复辟者相似，不足以为准绳。——摘编自潘天寿《中国绘画史》他（指康有为）是从晚明到清末三百年来从文化高度观察、评议西方美术优点的第一人；他又是近现代敢于承认中国传统美术缺陷的第一人。——摘编自吴甲丰《对西方艺术的再认识》

据材料二，归纳康有为振兴画学的主张。结合时代背景，分析他提出这一主张的原因。