In order to keep fit,you will take exerc

题型:选择题

问题:

In order to keep fit,you will take exercise_________ and eat healthily. [ ]

A. regularly    

B. generally    

C. extremely

D. approximately

考点:副词
题型:选择题

(9分)李军同学在做“蚯蚓走T形迷宫”实验中,用粗糙纸壳剪成“T”形迷宫,在迷宫一臂安上电极,而另一臂是有食物的潮湿暗室,在实验过程中,老师经常让李军用浸水的湿棉轻擦蚯蚓的体表,蚯蚓要经过大约200次尝试,遭受许多次轻微的点击才学会直接爬向潮湿的暗室。回答下列问题:

(1)观察蚯蚓的外形特征,会发现它的身体是由许多彼此相似的环状结构构成的,这些环状结构是             ,其中,有一个宽度最大,颜色较浅且又光滑的环状结构叫做           ,它靠近蚯蚓身体的      端。因此,可以借此来判断蚯蚓的前后端。

(2)用手指来回触摸蚯蚓的腹部,可以感觉到有一些粗糙不平的小突起,它们是          ,这些小突起能在        的协调配合下,使身体蠕动。

(3)为什么“T”形迷宫使用粗糙纸壳,而不用光滑的玻璃板?

                                           

(4)在实验过程中,要用浸水的湿棉球轻擦蚯蚓的体表是为了使其体表保持湿润,这样有利于蚯蚓进行                  ,否则蚯蚓可能会死亡。

(5)蚯蚓经常大约200次尝试,遭受了许多次轻微的点击最后直接爬向潮湿的暗室,说明蚯蚓具有       能力,这种能力比公鸡          。(填“强”或“弱”)

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依据《注册安全工程师执业资格制度暂行规定》,取得安全工程、工程经济类第二学士学位或研究生班毕业,从事安全生产及相关工作满( )年的中华人民共和国公民,可以申请参加注册安全工程师执业资格考试。

A.7

B.5

C.3

D.2

题型:选择题

下列关于化学实验操作的叙述中,正确的是(  )

A.直接将试纸浸入溶液中,测定溶液的

B.在未说明用量时,一般液体取5毫升左右,固体盖满试管底部

C.稀释浓硫酸时,应把浓硫酸慢慢注入盛有水的量筒内

D.给试管中的固体加热,试管口应稍稍向下倾斜

题型:选择题

一般情况下,连铸坯从边缘到中心由()三层凝固结构组成。

A.柱状晶区-激冷层-中心等轴晶区

B.中心等轴晶区-柱状晶区-激冷层

C.激冷层-柱状晶区-中心等轴晶区

题型:选择题

Recycling Paper


The process of recycling paper can help to reduce deforestation and energy consumption on a significant scale. There are many different reasons why we should recycle paper products, and some of these are (26) in the paragraphs below.
Energy consumption will always be on the (27) as population levels grow, and so any manufacturing processes which help to reduce energy consumption are (28)
The Energy Information Administration (EIA) claim that there can be as (29) as a 40% energy saving when recycling paper over producing paper (30) the direct raw material.
Although recycling paper has many (31) , it also has its drawbacks. One of these drawbacks is that we cannot recycle the (32) paper product for eternity, as the fibers contained within the paper degrade over time, (33) their strength and length.
On (34) , an individual paper fiber can only be recycled a (35) of six times. Although this is a significant drawback, the six time recycling process will help to (36) a great deal of energy when you consider (37) much paper there is to be recycled.
If paper fibers can be recycled up to 6 times, and we recycled all paper products, this could help to (38) the intensity of deforestation for paper products up to a factor of 6.
With paper production said to (39) around 40% of harvested wood, and paper said to (40) around 90% wood, you can see how recycling paper is an important process for the (41) of our forests.
Today, the use of recycled paper products is on the increase, as more and more people begin to recycle paper (42) products around the home.
Although there are slight differences in the recycling processes of different (43) of paper products (e.g. corrugated, mixed paper, newspaper products), we are able to recycle just about any type of paper product around today.
The recycling logo helps to (44) a recyclable product and can also sometimes help to identify if the product contains any recycled material, in the form of a percentage. This helps a consumer to identify the (45) of recycling various products.

A. welcomed B. challenged C. created D. introduced

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