[填空题]If you look to the right, you will see a road of great ______ (wide).

[填空题]
I. What you’ll see:
The route of the Historic National Road is a road of history. River transportation and (1) , and historic cemeteries tell the struggles of the early settlers. And you can still find soda fountains, one-room schools, and old hotels. Museums are found all along the byway. You can appreciate (2) Native American life and giant earthwork mounds.
II. Archaeological:
The remarkable World (3) Archaeological Site consists of the largest mound buildings which were built by Native Americans on the North American continent. You may notice Woodhenge next to the road, which is a large circle of wooden posts.
III. Historical:
Construction of the Illinois section was started in 1831, and the section to Vandalia was completed in 1836. But the National Road fell into (4) , only to be resurrected in the early 1920s. On the eastern end of

[单项选择]Did you ever wonder why you see the colors you do or if other animals see the same colors that you see We see light that bounces off of things around us. When the light enters our eyes, special cells tell our brains about the light. These cells are called photoreceptors. Light is made of little bits called photons. When the sun shines, trillions and trillions of these little bits of light fall on the earth. The photons bounce off of almost everything and some of them enter our eyes. Those bits that enter our eyes allow us to see. So, where does the color come from Starting in the 1600s with Sir Isaac Newton, scientists have believed that there are different kinds of photons. Different types give rise to our sense of colors. The different photons are said to have different wavelengths. Sunlight contains all the different wavelengths of photons. The visible wavelength colors can be seen when you look at a rainbow. Raindrops acting as natural prisms produce the colors.
A. colors
B. black and white
C. both colors and black and white
D. visible wavelength colors