第二部分英语知识运用（共两节，满分35分）
第一节：单项填空（共15小题；每小题1分，满分15分）
从A、B、C和D四个选项中，选出可以填入空白处的最佳选项, 并在答题纸上将该选项标号涂黑。
21. President Obama called Mandela ______ “personal hero” while he was on _____ visit to South Africa in July, 2013.
A. a; a B. the; the C. the; a D. a; the
22. It’s a great _______ for a person to be able to speak fluent English when he is seeking a job.
A. chance B. benefit C. advantage D. fortune
23. The book tells stories of the flooding brought by Typhoon Fitow through the eyes of those _______lives were affected.
