The _____ plays a key role in the city’s transportation system.
举一反三
- Among the following modes of transportation, ( ) is the earliest mode of transportation used by human beings, but it still plays an important role in the modern transportation system. A: Railway transportation B: Water transportation C: Road transportation D: Pipeline transportation
- Shell plays a key role in helping to meet the world's growing demand for energy.
- The muscular system also plays a role in regulating body temperature.
- Which of the following plays a key role in one's learning and memory? A: The kidneys. B: The adrenal hormone. C: The stress hormone. D: The hippocampus.
- The money market plays a key role in assuring companies and governments maintain the appropriate level of liquidity.