Hearing the old man’s report, the officer _______ from his seat and said something must be done to ________ people’s living standards. A. raised; rise B. rose; raise C. raise
Plants are very important living things. Life could not go on if there were no plants. This is because plants can make food from air, water and sunlight. Animals and man cannot make food from air,
满足
，且当
，
，则不等式
的解集为 .
