下列程序返回的结果是a = "first"def second(a): a = "second"def third(): global a a = "third"third()print(a, end=',')second("fourth")print(a)? third, third;|second,third;|second,first|first,second;

U20-5/ America’s Thanksgiving Day is on _____: A: the fourth Thursday of October B: the fourth Thursday of November C: the fourth Tuesday of October D: the fourth Tuesday of November

- What's the date today? - It's _____ . A: May the fourth B: May fou C: the May fourth D: fourth May

Thanksgiving Day is celebrated on _________. A: Fourth Thursday of November B: Third Thursday of November C: Fourth Thursday of October D: Fourth Thursday of September

In the US, Thanksgiving Day is celebrated on the _______. A: Fourth Thursday of Novembe B: Fourth Tuesday of Novembe C: First Thursday of Novembe D: Fourth Thursday of Decembe

When does the Dragon Boat Festival fall on _____? （ ） A: the fourth day of the fourth lunar month B: the fifth day of the fifth lunar month C: the fourth day of the fifth lunar month D: the fifth day of the fourth lunar month

Please pass me ____ book on the right. A: fou B: fourth C: the fou D: the fourth

Father's Day is ___the third Sunday in June. A: fourth B: the fourth C: four D: the four

Word中插入数学公式的方法是（）。 A: "插入"→"形状"→"公式" B: "开发工具"→"公式" C: "插入"→"公式"→"插入新公式" D: "引用"→"插入"→"公式"

____ of the land ____ covered with water. A: Three fourth; is B: Three fourth; are C: Three fourths; is D: Three fourths; are