题目

Eyesight plays a very important role in our daily life. Every waking moment, the eyes are working to see the world around us. Over forty percent of Americans worry about losing eyesight, but it's easy to include steps into our daily life to ensure healthy eyes. Here are five suggestions for a lifetime of healthy eyesight：·Schedule yearly exams. __11__ Experts advise parents to bring babies 6 to 12 months of age to the doctor for a careful check. The good news is that millions of children now can have yearly eye exams and following treatment, including eyeglasses.·Protect against UV rays (下列表述正确的是A．二氧化硫、氨、煤的液化均为物理变化B．2CH3CH2OD＋O22CH3CHO＋2DHOC．甲醇、乙二醇、丙三醇都为饱和醇，熔沸点依次降低D．已知常温下氢氧化镁的溶度积常数为a，则氢氧化镁悬浊液中：