[单项选择]伴随持续的评价和及时反馈的研究方法是（）
A. 教育经验总结法
B. 教育实验法
C. 行动研究法
D. 个案法

The origin of Earth’s moon, the largest moon in the {{U}} (36) {{/U}} system, is still something of a mystery. There are some theories about its origin however. Now, keep in mind that a theory of the moon’s origin has to be {{U}} (37) {{/U}} with two important facts. The first fact is that the Earth {{U}} (38) {{/U}} a lot of iron, most of it has an iron core. But the moon contains {{U}} (39) {{/U}} no iron. The second fact is that other than the difference in iron content, the moon and Earth are {{U}} (40) {{/U}} of the same minerals, a {{U}} (41) {{/U}} not shared with any other planet or moon in our solar system. One of the earliest theories of the moon’s origin, I called it the Capture Theory, proposes that the moon was somehow captured by Earth’s gravitational force. This theory is improbable, {{U}} (42) {{/U}}, because it assumes that the moon and Earth formed in different parts of the solar system. If this was true you would {{