通过对这一段的学习,我们知道了这种背包最重要的特性就是:当背上它的人一边走就会一边产生电能。所以答案为A。
4.让我们继续看第三题:
3. The word springs in Paragraph 3 means ____________.
A) a small stream of water flowing naturally from the earth.一小股自然流淌的水流(泉水)
B) the season of the year, occurring between winter and summer.一年中的一个季节,介于冬季和夏季之间(春天)
C) the act or an instance of jumping or leaping. 突然跳起来(蹦)
D) a length of metal wound around, which returns to its original shape after being pushed. 来回绕的一段金属,在被挤压后能回复它的原形(弹簧)
这种题型属于曾经介绍过的单词释义题,通常所面对的词汇是多义词,但要通过它出现的上下文,猜测出它的含义。Spring当动词时,意思是蹦、跃起;当名词讲,是泉水、弹簧、发条、春天等。让我们看看文章里含有该词的句子:
The backpacks electricity-creating(产生的) powers (能量)depend on springs used(被用来) to hang(挂) a cloth pack(布包) from its metal frame(金属框架).
所以,可以推断spring只能当弹簧讲,因此答案是D。
The frame sits(搁、放) against (倚、靠)the wearers back, and the whole pack(包) moves up and down(上下移动) as(当) the person walks. A gear ()mechanism(机械装置) converts(转化) vertical(垂直的) movements of the pack to rotary (旋转的)motions(运动) of an electrical generator(电子发电机), producing up to(多达) 7.4 watts(瓦,电功率单位).
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