A、Visit Laredo in summer and Amarillo in winter. B、Visit Laredo in winter and Amarillo in summer. C、Visit Laredo in spring and A

Texas was the biggest state before Alaska became the forty-ninth state in 1959. Texas is smaller than Alaska, but it is much bigger than the other states. One good way to understand the size of Texas is to learn about its weather. Different parts of the state have very different kinds of weather.
    Laredo, Texas, is one of the hottest cities in the United States in summer. The best time to visit Laredo is in winter, when it is pleasantly warm.
    Amarillo gets very cold in winter. Sometimes there is more snow in Amarillo than in New York, which is a northern city. Summers are better, but sometimes it gets quite hot. The best time to visit Amarillo is in the autumn when it is cool.
    If anyone asks you about the weather in Texas, ask him, "What part of Texas do you mean?"
Questions 19 to 21 are based on the passage you have just heard.
19. Which of the following statements is correct in describing the size of Texas?
20. Which of the following statements is correct about the weather in Texas?
21. If you were going to travel in Texas, how would you plan your tour to enjoy nice weather everywhere you went?