中国大学MOOC: Tear ducts (泪腺) operate on a normal basis to and protect the eye. When you have an emotion, they overact and create tears. (lubrication)
举一反三
- Tear ducts (泪腺) operate on a n...tears. (lubrication)
- 中国大学MOOC: When you start a sentence with a dependent word, be careful not to create a/an________.
- The focus of a near-sighted eye is different from that of a normal eye. A: 中心 B: 集中 C: 对准 D: 焦点,焦距
- 5.According to what you have learned, which of the following is true?（多选） A: The red blood cells will collect around the tears when the injured tissue swells up. B: Oxygen deprivation(缺失) causes cardiac muscle cells to die. C: When you have atherosclerosis(动脉粥样硬化), you can find fat and cholesterol floating in your blood. D: The extra strain on the arterial wall produce big tears.
- 中国大学MOOC: When checking out, you have to return the keys.