高考每日一练（2019/6/19）

第1题： 我国实行按劳分配为主体、多种方式并存的分配制度是由 A．我国社会主义的性质和初级阶段的国情决定的 B．我国生产力落后和商品经济不发达决定的 C．我国社会主义市场经济决定的 D．我国广大人民的意志决定的

【单选题】： A     B     C     D

第2题：Rubidium, potassium and carbon are three common elements used to date the history ofEarth. The rates of radioactive decay of these elements are absolutely regular when averaged out over a period of time; nothing is known to change them. To be useful as clocks, the elements have to be fairly common in natural minerals, unstable but decay slowly over millions of years to form recognizable "daughter" products which are preserved minerals. For example, an atom of radioactive rubidium decays to form an atom of strontium (another element) by converting a neutron in its nucleus to a proton and releasing an electron, generating energy in the process. The radiogenic daughter products of the decay—in this case strontium atoms—diffuse away and are lost above a certain very high temperature. So by measuring the exact proportions of rubidium and strontium atoms that are present in a mineral, researchers can work out how long it has been since the mineral cooled below that critical "blocking" temperature. The main problems with this dating method are the difficulty in finding minerals containing rubidium, the accuracy with which the proportions of rubidium and strontium are measured, and the fact that the method gives only the date when the mineral last cooled below the blocking temperature.Because the blocking temperature is very high, the method is used, mainly for recrystallized (igneous or metamorphic) rocks, not for sediments—rubidium-bearing minerals in sediments simply record the age of cooling of the rocks which were eroded to form the sediments, not the age of deposition of the sediments themselves. Potassium decays to form (a gas) which is sometimes lost from its host mineral by escaping through pores.Although potassium-argon dating is therefore rather unreliable, it can sometimes be useful in dating sedimentary rocks because potassium is common in some minerals which form in sediments at low temperatures.Assuming no argon has escaped, the potassium-argon date records the age of the sediments themselves. Carbon dating is mainly used in archaeology. Most carbon atoms (carbon-12) are stable and do not change over time. However, cosmic radiation bombarding the upper atmospheres is constantly interacting with nitrogen in the atmosphere to create an unstable form of carbon, carbon-14. What is the limitation of the rubidium method A、Rubidium is everywhere in the rock. B、Strontium atoms are hard to detect at the normal temperature. C、It cannot date sediments. D、It is time-consuming.

【单选题】： A     B     C     D

第3题：20世纪20年代，上海成为中国电影的制作中心，当时在上海放映的各种影片中，外国片与国产片比例约为2：1：而在北京和天津，这一比例高达5：1甚至6：1。上海与京津放映中外电影比例不同，能够说明这一现象的应是 A、外国电影的制作水平较高 B．京津民众对外来事物更具热情 C．中国电影拷贝流通税费重 D．上海民众的社会心态更为开放

【单选题】： A     B     C     D

第4题：

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第5题：(本小题满分13分)

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第6题：It is useful to be able to predict the extent ______ which a price change will affect supply and demanD、 A、from B、with C、toD、for

【单选题】： A     B     C     D

第7题：听第6段材料，回答第6至7题。 Why is Harry unwilling to join the woman A、He has a pain in his knee. B．He wants to watch TV. C．He is too lazy.

【单选题】： A     B     C     D

第8题：Questions 11 through 13 are based on the following passage. A、The houses there can’t be B．It is a place for work and holiday. C．he cabins and facilities D．It is run by the residents themselves.

【单选题】： A     B     C     D

第9题：(本题满分14分) 本题共有2个小题，第1小题满分6分，第2小题满分8分． 如图, 某公司要在A,B两地连线上的定点C处建造广告牌, 其中D为顶端,AC长35米,CB长80米. 设点A,B在同一水平面上, 从A和B看D的仰角分别为α和β。 施工完成后,CD与铅垂方向有偏差．现在实测得α=38.12 ,β=18.45,求CD的长(结果精确到0.01米)．

【分析题】：

第10题：Clearly and thoughtfully________, the book inspires confidence in students who wish to seek their own answers. A、writing B．to write C．written D．being written

【单选题】： A     B     C     D