题干

对下列句子中划线词的解释,正确的一项是(    )

A:兵下令军中《魏公子列传》          约束

B:久立公子车骑市中《魏公子列传》   特意

C:疾入赵壁《淮阴侯列传》           如果

D:举兵,吾从此助公《淮阴侯列传》  只是、但是

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A

同类题1

在社会可持续发展的历史进程中,人类要合理地开发和利用能源、资源,保护好环境,这一切都离不开化学.

(1)研究发现,化学反应伴随着能量的变化,许多化学反应的能量变化主要是表现为____ (填“热量”或“光能”)的吸收或放出.大自然利用太阳能最成功的是植物的光合作用,绿色植物在光合作用中把太阳能转化为____ (填“电能”或“化学能”).原电池是一种常见的能量转化装置,在原电池中发生的化学反应属于____ (填“氧化还原反应”或“非氧化还原反应”).

(2)燃气公司要把一套以煤气(主要成分是CO、H2)为燃料的灶具改为以天然气为燃料的灶具时,灶具应作相应调整,合理的方法是____ (填字母).

a.增大空气的进入量            

b.增大天然气的进入量

c.空气和天然气的进入量都减小

(3)目前,石油和煤不仅是主要的能源,也是重要的化工原料.下列石油或煤的加工过程中,能够得到苯的是____ (填字母).

a.石油的裂解            b.煤的干馏             c.石油的分馏

(4)已知某地区酸雨污染比较严重.分析该地区降雨的成分发现,雨水中的阴离子以硫酸根离子为主,约占阴离子总量的62%;阳离子以铵根离子为主,约占阳离子总量的84%.阴离子中SO42和NO3的质量比约为4.13:1,且NO3的比例呈明显上升的趋势.

①该地区大气污染的特征是____ (填字母).

a.煤烟型           

b.机动车尾气型

c.由煤烟型向煤烟型与机动车尾气混合型转化

②请你给出该地区防治酸雨的两条主要措施:____ 、____ .

③某研究小组拟选择“不同地点空气中二氧化硫的含量分析”为课题进行探究.如果你参加该课题的探究,在小组讨论测定地点时,你建议选择的测定地点分别是____ (至少答出3种不同类别的地点).

(5)汽车尾气中含有氮氧化物和一氧化碳等有害气体,在加装了汽车尾气处理装置后,可以使尾气中的有害成分在催化剂作用下转化为N2、CO2排出.现在有NO、NO2、CO三种气体组成的混合气甲40.32L(标准状况下),在催化剂存在下充分反应后,得到无色无毒的混合气乙,再将乙通入到足量的石灰水中生成100g沉淀,则原混合气甲中NO与NO2的体积比为____ .

同类题2

阅读理解

    For many years, Bruce Bexler dreamed of going to the lands no human had explored and discovered rare, unknown species. That might sound like an impossible dream, but Bexler turned it into a reality.

    In December 2015, he, together with a team of Australian and American scientists, adventured into a rain forest on the island of New Guinea. They were the first people ever to enter the region. “As we were dropped on the ground by helicopter, we found no trails anywhere; it was really hard to get around,” Bexler says.

    Within minutes of landing, the team spotted a black chicken-like bird. The scientists soon determined that the creature was a type of honeyeater-the first new bird species to be sighted on New Guinea in 60 years. The honeyeater wasn't the only surprise for them. They discovered more than 40 previously unknown plant and animal species. “We were like kids in a candy store?' Bexler recalls. “Everywhere we looked, we saw amazing things we had never seen before.”

    The new found species didn't shy away from the scientists. Two long-nosed echidnas even let the visitors pick them up and take them back to camp to study them. Bexler thinks the animals weren't scared because they had never seen humans before. He explains, “This area gives scientists a place where they can study the behaviours of animals that have not yet learned to be afraid of people.”

    Bexler and his team did not have enough time to study the area completely. “We just scratched the surface, Bexler says. “Anyone who goes there will come back with a mystery.”