Which is the only type of commodity where_爱下问搜题

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问题单项选择题

Which is the only type of commodity where trading in forward contracts is larger than trading with future contracts

A．

A. Agricultural.

B．

B. Foreign currency.

C．

C. Interest rate.

答案

参考答案：B

解析：Trading in foreign currency forwards is far larger than the trading in futures. For example, with international trade, businesses can hedge against adverse currency fluctuations. But each business arrangement is unique, and most require the flexibility of a forward, whose terms are not standardized, that meets their special needs.

问答题

下表为长式周期表的一部分，其中的编号代表对应的元素．

请回答下列问题：

（1）表中属于d区的元素是______（填编号）．

（2）科学发现，②、④、⑨三种元素的原子形成的晶体具有超导性，其晶胞的结构特点如右图所示（图中②、④、⑨分别位于

晶胞的体心、顶点、面心），则该化合物的化学式为______（用对应的元素符号表示）．

（3）元素②的一种氢化物是重要的化工原料，常把该氢化物的产量作为衡量石油化工发展水平的标志．有关该氢化物分子的说法正确的是______．

A．分子中含有分子间的氢键 B．属于含有极性键的非极性分子

C．只含有4个sp-s的σ键和1个p-p的π键D．该氢化物分子中②原子采用sp²杂化

（4）某元素的价电子排布式为nsⁿnpⁿ⁺¹，该元素原子的核外最外层电子的孤对电子数为______；该元素与元素①形成的18电子的X分子（分子量32）的电子式为______；该元素还可与元素①形成10电子的气体分子Y（分子量17），将过量的Y气体通入盛有硫酸铜水溶液的试管里，现象为______．

（5）下表为原子序数依次增大的短周期元素A～F的第一到第五电离能数据．

电离能I（eV）	A	B	C	D	E	F
I₁	11.3	14.5	13.6	5.2	7.6	6.0
I₂	24.4	29.6	35.1	49.3	15.0	18.8
I₃	47.9	47.4	54.9	71.6	80.1	28.4
I₄	64.5	77.5	77.4	98.9	109.2	112.0
I₅	392.1	97.9	113.9	138.3	141.3	153.7

请回答：表中的金属元素是______（填字母）；若A、B、C为原子序数依次增大的同周期相邻元素，表中显示B比A和C的第一电离能都略大，其原因是______．

完形填空

Alcohol is often taken as a symbol of a special celebration or as a sign of friendship. So it is       to see people toasting with a large glass of alcohol to the health or fortune. Unfortunately, every year, alcohol also ruins thousands of lives and destroys many happy families.
Some people drink alcohol to     their tension or pain. They mistakenly think that through drinking, they can     from their problems and worries. But it is never a    . During those hours of drinking, alcohol only numbs their senses and makes them forget their worries. However, when they wake up, their problems are still unsolved.
A     alcohol drinker is running the great risks of getting heart diseases and liver failure. Too much alcohol taken into the body system, death will     occur. Alcohol also affects unborn babies disastrously. Those pregnant mothers with     alcohol in their blood system risk causing their unborn babies to suffer from defects (缺陷) at birth.    , babies are innocent victims due to their mothers’ mistakes. Therefore they should be extremely cautious of any alcohol and it is better to     all drinking during pregnancy.
Drunken driving is one of the worst     of alcohol abuse. Every year, many lives are lost due to    driving on roads and highways. A drunk driver cannot see and judge the distance clearly and will find it difficult to control his vision and     on the road, so he fails to control over his reflexes. That is how accidents occur. Not only does he hurt himself but also other innocent road users.

C．First of all

D．imagination