请简述北戴河海滨的旅游特色。
参考答案：
北戴河海滨地处河北省秦皇岛市区西南，以滩缓、沙细、浪小、潮平著称。海蚀地貌发育，各种形态的岩石，栩栩如生。
By using MP3, a 600M-byte music CD can be (70) to 50M bytes or less. It can be streamed (downloaded in chunks)so that you can begin listening to the opening bars while the (71) of the file arrives in the background. And, most important, MP3 music files retain good listening (72) that (73) compression schemes lacked. That (74) of features makes accessing and distributing music on the Web practical for the first time.
A．earlier
B．front
C．backward
D．later
肾病综合征应用肾上腺皮质激素治疗的副作用有()
A．杀白细胞
B．骨质疏松
C．血压升高
D．免疫功能低下易感染
E．生长发育阻滞
