The old street lights were _____________ by more energy-efficient models.
举一反三
- 中国大学MOOC: 单选题The kids were told _______ cross the street ________ the traffic lights turnedgreen.
- The green building movement originated from the need and desire for more energy efficient and environmentally friendly construction practices.
- Some of the most efficient refrigerators ( ) 70 percent less electricity than traditional models.
- The street lights come on at dusk and go off___（at dawn）.
- My new computer’s much faster and more ________ than the old one. A: effective B: proficient C: affective D: efficient