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E-waste is fast becoming a serious problem around the world. This report will examine this problem and provide some possible ways to solve it. We live in a society that is producing and using electronics(电子产品) all the time. It is often cheaper to buy new products than to repair old ones. Also, through clever advertising, companies always encourage people to change their old TVs, mobile phones and computers for the latest models. E-waste is created when we throw away old ones. In the EU alone, about 8,700,000 tons of e-waste is produced each year. Sadly, just over 1,000,000 tons is recycled. Burying(填埋) e-waste or burning it cause serious problems for the environment. Electronics have dangerous things in them. These things can then get into the ground or pollute the air when they are burnt. In recent years, ____. However, their plans are not always managed properly. Sometimes electronics are just sent to poor countries such as Ghana. Here they are often burnt in public areas, which is very bad for people’s health. Setting up recycling centers is a good way to solve this problem. E-cycling centers could recycle the parts that can be reused and deal with the rest properly. Another way is to make producers responsible(负责任) for their used products. This means that producers must take back old products which are no longer wanted. They should then make sure they are properly recycled or reused. As for us, we should try to cut down on e-waste. Change electronics only when we have to. And don’t buy a product just to have the latest model. E-waste is a serious problem in the modern world. Both producers and users must take actions and try to keep it to the smallest amount. 小题1:According to the passage, it is often _______ to buy new electronics than to repair old ones. A.more expensive B.more difficult C.cheaper D.worse 小题2:In the passage the underlined word “they” refers to ______. A.the old products B.the producers C.the users D.the new products 小题3:Which of the following is the best for the blank in Paragraph 4? A.the e-waste problem has been solved B.the e-waste problem continues growing C.many countries have started recycling e-waste D.people haven’t realized the e-waste problem yet 小题4:Which sentence shows the writer’s opinion? A.Burning e-waste causes problems for the environment. B.E-waste problem is very serious and people should take actions. C.Sometimes electronics are sent to poor countries such as Ghana. D.In the EU alone, about 8,700,000 tons of e-waste is produced each year.
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【单选题】錾削时錾子的切削刃应与錾削方向倾斜一个角度,大约为( )。
A.
10°~25°
B.
15°~30°
C.
25°~40°
D.
30°~45°
【判断题】按摩可以分为自动按摩和人工按摩。
A.
正确
B.
错误
【单选题】将含100个结点的完全二叉树从根这一层开始,每层上从左到右依次对结点编号,根结点的编号为1。编号为49的结点X的双亲的编号为( )。
A.
24
B.
25
C.
23
D.
无法确定
【单选题】关于太阳辐射及其对地球影响的叙述正确的是 [     ]
A.
太阳辐射巨大能量来源于太阳内部核聚变反应
B.
太阳辐射能大部分到达地面,从而维持着地表温度,因而成为地理环境形成和变化的重要因素
C.
太阳辐射能是地球上大气、水、生物和火山活动的主要动力
D.
煤、石油等埋藏在地下,它们是属于地球内部的能源
【单选题】錾削时,錾子的切削刃应与錾削方向倾斜一个角度,此角度大约在()之间
A.
15°~25°
B.
25°~40°
C.
40°~55°
D.
55°~70°
【单选题】下列叙述中,不属于太阳活动对地球影响的是______。
A.
无线电短波通信受到干扰
B.
产生“磁暴”现象
C.
出现极光现象
D.
产生潮汐现象
【单选题】太阳辐射对地球影响的叙述,正确的是
A.
太阳辐射是地球上获得能量的唯一源泉
B.
太阳辐射是地球上地震活动、火山爆发的主要动力
C.
煤、石油和天然气是从地下开采出来的,所以这些能源不属于太阳辐射能
D.
“万物生长靠太阳”说明太阳辐射与我们的农业生产密切相关
【简答题】将含100个结点的完全二叉树从根这一层开始,每层从左至右依次对结点编号,根结点的编号为1。编号为47的结点X的双亲的编号为( )。
【单选题】将含100个结点的完全二叉树从根这一层开始,每层从左到右依次对结点编号,根结点的编号为1。编号为49的结点X的双亲编号为(39)。
A.
24
B.
25
C.
23
D.
无法确定
【单选题】将含100个结点的完全二叉树从根这一层开始,每层从左到右依次对结点编号,根结点的编号为1。编号为71的结点的双亲的编号为( )
A.
34
B.
35
C.
36
D.
无法确定
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