综合实践活动课程四大指定领域中处于核心地位的是（）
A.研究性学习
B.社区服务与社会实践
C.劳动与技术教育
D.信息技术教育
参考答案：A
根据句意，在空白处填一个恰当的词。
1. You should not eat noodles for supper. You should eat some other food.
2. I often feel at about 12:00 at noon. It is time for food.
3. After a day's work, my father gets very _______.
4. People should wash their hands they have meals.
5. It's ______ to keep healthy.
某债券的修正久期为10.5年，如果该债券收益率下降100个基点，根据该债券的修正久期估计，价格变化的百分比将为______。
A．24.00%B．19.00%C．12.00%D．10.50%
