2013
高考英语：二轮单项选择+冠词专练05（答案、解析） 第***套 1. sustainable development is long-term ______which focuses on the environment and _____ natural resources. a. plan; preserve b. plan; preserving c. planning; preserving d. planning ;preserve 2. a giant helium(氦) balloon is telling residents of paris how good or bad the air quality is. when it’s good, the balloon ----measuring 22 meters wide and 32 meters high---shines green. _________, it’s red.
