[简答题]S5. Why are people unable to see clearly even in daytime in New York

[简答题]Why are people unable to see clearly even in daytime in New York

[填空题]What things can nearsighted people see clearly
Things which are very ______ their eyes.

[填空题]Biologists are unable to explain why frogs are dying.

[单项选择]Why is the man unable to help the woman
A. He is on his way to the accounting department.
B. He has to complete some data entry.
C. He is running an errand for Mr. Washington.
D. He has to trim down some articles.

[填空题]Animals, even the highest apes are unable to pronounce words because they have a brain comparatively __________ to that of man.

[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. the human eye is sensitive to all wavelengths
B. colors are related to wavelengths
C. there are more color-blind women than color-blind men
D. failure of rods cause color-blindness