题目

Teeth are important. Strong , healthy teeth help you chew(咀嚼) foods that help you grow. They help you speak clearly. And yes ,they help you look best. Here are some tips for you to take care of you teeth:     1. Brush your teeth the right way. Brush your teeth at least twice a day – after breakfast and before bedtime. If you can, brush after lunch or after sweet snacks, too. Brush all of your teeth, not just the front ones. Spend time brushing teeth along the sides and back of your mouth. Spend at least three minutes each time you brush. Play a song you like to help pass the t(2006年黄冈) --- ________ is “Lucky 52” shown on CCTV-2? --- Every week. [　　] A．How oftenB．How long C．How soonD．How many times