第一节:单项填空(共15小题;每小题1分,满分15分)
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。
21. .Heat capacity is _______ amount of energy _______ takes to
_______ the temperature of a substance by one degree centigrade.
A. the; it;
raise B.
an; that; rise C. the; it;
rise D.
an; it; raise