阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项。
A
Explorers Camp
•Full day camp for kids aged 5-13.
•Monday-Friday, July 8-26, 9am-4pm.
Week 1 | July 8-12
Week 2 | July 15-19
Week 3 | July 22-26
•Register for a single week or multiple weeks.
•Fees: $365 per week.
•The last day to cancel registration and receive a full refund (退款) is June 15.
Camp Structure
The day is divided into two thematic sessions per age group. Campers have a three-hour morning class engaging with a morning theme (9am to 12 noon) and a one-hour lunch break, followed by another three-hour class engaging with an afternoon theme (1pm to 4pm). Snack periods are held throughout the day. All campers should bring their own bagged lunch and snacks.
Camp Content
Explorers Camp organizes engaging arts, history and science-related activities in every! class, and focuses on a range of topics that emphasize active learning, exploration and, most of all, fun! All camp sessions are created with age-appropriate activities that are tailored to the multiple ways that kids learn.
Camp Staff
Campers enjoy a staff-to-child ratio ranging from 1:4 to 1:7 depending on the age group. Instructors are passionate educators who are experts in their fields and have undergone training and a background check.
On which of the following dates can you cancel your registration with a full refund?
细节理解题。根据“The last day to cancel registration and receive a full refund (退款) is June 15. (取消注册并获得全额退款的最后一天是6月15日)”可知，你可以在6月12日取消注册并全额退款。故选A。
How are campers divided into different groups?
细节理解题。根据Camp Structure部分中的“The day is divided into two thematic sessions per age group.(白天按每个年龄组分为两个专题会议)”可知，露营者按年龄划分成不同的小组。故选D。
How many hours of class will you have altogether if you register for a single week?
细节理解题。根据“•Monday-Friday, July 8-26, 9am-4pm.( 7月8日至26日，星期一至星期五，上午9点至下午4点)”可知，每周安排5天的活动。根据Camp Structure部分中的“Campers have a three-hour morning class engaging with a morning theme (9am to 12 noon) and a one-hour lunch break, followed by another three-hour class engaging with an afternoon theme (1pm to 4pm).(露营者有一个三小时的上午课程（上午9点到中午12点）和一个小时的午休时间，然后是另一个三个小时的下午课程（下午1点到下午4点）)”可知，全天有6个小时的课程。5*6=30。由此可知，如果你注册一周，你总共有30小时的课程。故选C。