2. 外语
  3. 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)____

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)____

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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.
(18)
选项 A、/
B、are
C、were
D、be
答案A
解析 语法题。因为这个长句的主干部分是“two：persons can stand in…”，空格所在的部分属于伴随结构，所以不能出现are，were或be这样的动词时态，但是可以不填，直接用reflected这个过去分词表示“被反射的(光线)”，所以正确答案为[A]。
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