When a light beam hits an object, such as tree leaves or an apple, the color of the object affects the smaller color
beams inside the entire light beam. The green leaves
absorb all of the color beams except green. Only the
green beam is reflected back, so our eyes see the
leaves as green. The apple absorbs all of the color
beams except red. Only the red beam is reflected back,
so our eyes see the apple as red.
1. What is the author's purpose for writing? (There may be more than one
correct answer.)

the illustration   that would give a reader a clear understanding of the text is a picture of men constructing the frame of a building.the frame is made of iron bars. the text describes the job of blacksmiths'. these were very organised and they had different names: "the driver" and "the heater". the text describes the way in which these men worked ; they worked iron pieces as if they were playing a sport. in fact, the text wants to show the men's skills. the text also puts some emphasis on the use of '' rivets'' in construction. this kind of nails were not always used in the construction of manhattan.

some examples:

"and with an underhand toss he hurled the smoking rivet straight at the catcher, who caught it in mid-air in his catching can." men's skills

"when the driver was ready for a new " the emphasis on the rivet ( special nail used in construction).

" it against a beam to remove any cinders, and jammed it into the waiting hole. " the emphasis on the rivet.

uncanny would be like unlucky or disaster. you can look for more in the dictionary or if you have text book then turn to a. 17 but it's different with textbooks.