What's this 3. How many books do you have 4. Let's have a race. 5. I see sixteen cats. 答案: 一、1.C 2.A 3.B 4.B 5.C 二、1.B 2.B 3.B 4.B 5.A 三、17 11 20 18 12 四、1.B 2.B 3.A 4.A 5.A 五、1.T 2.F 3.F 4.F 5.T 六、1.A 2.C 3.E 4.D...
The pupil is the small opening in the eye through which light passes, and the size of the pupil can change as a function of light levels as well as emotional arousal. When light levels are low, the pupil will become dilated, or expanded, to allow more light to enter the eye. When ...
Describe dark field microscopy. Explain how horses and cats focus on objects. Is the way similar or different? Describe the path traveled by a ray of light as it enters the eye and passes to the retina. How do humans actually hear in detail?