2. 职称英语
  3. The nature of light is not wholly known, but it is generally believed to be

The nature of light is not wholly known, but it is generally believed to be

游客2023-11-10  26
问题     The nature of light is not wholly known, but it is generally believed to be matter, as in its(1)______, it obeys the laws(2)______matter. So closely is it connected with heat and electricity that there can be (3)______ doubt of their all being(4)______ different modifications of the same substance. The effects of light(5)______ other bodies and how light is affected by them(6)______ some important principles.
    Rays of light are reflected from one surface to(7)______. It is by this reflection of light that objects are(8)______ visible. However, unless light falls directly(9) ______the eye they are invisible, and are not(10)______felt until after a certain series of operations upon the various coverings of the eye. Smooth and(11)______surfaces reflect light most powerfully, and send to the eye the images of the objects (12)______ the light proceeded before reflection. Glass would be of no use to us as a mirror, were it not first(13)______on one side, interrupting the rays in their(14)______from the glass into the air. The reason why trees, rocks and animals are not all mirrors is that their surfaces are(15)______, and rays of light reflected from such a surface are(16)______in every direction. Stand before a mirror and your image is formed and appears to be as far(17)______the glass as you are before it. Rays of light(18) ______reflected at the same(19) ______at which they fall upon a mirror, two persons can stand in (20)______ position that each can see the image of the other without seeing his own. [br] (12)
选项 A、that
B、when
C、with which
D、from which
答案 D
解析 语法题。此处是一个定语从句，先行词为objects，从句中的谓语是proceed，为不及物动词，后面搭配的介词应该是from，表示“源于……”。因此正确答案是[D]from which，其他选项均不符合语法和句意要求，故排除。
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