[单选] DHi， I"m Zhang Lin．I"m in the U．S．A．now．Do you know about schools in the U．S．A．？ Let me tell you．Schools in the U．S．A． are not the same as（与……一样）schools in China ．Usually，they have no school uniforms（校服） ．In Chinese schools，students have school uniforms ． Classes start at 8:30 every morning and the school day finishes at 3:30 or 4:00 in the afternoon in the U．S．A．And in China， classes usually start at 8:00 in the morning and the school day finishes at 5:30 in the afternoon．Students have one hour for lunch and two 20 -minute（分钟）breaks each day in the U．S．A．One break is in the morning， and the other（另一个）is in the afternoon． In China， students have two hours" break during（在……期间）lunchtime and ten minutes" break for each class period（一段时间） ．In the U．S．A，students often go to the school cafeteria（ 自助食堂）at lunchtime or at break ． They buy food there ． They like playing baseball， football and basketball after school． I often play them with my friends．（）61．When do Chinese school students have classes in the morning？