用一单色光源垂直照射带有圆孔的不透明光屏，下列几种情况中，在圆孔后面的光屏上各看到什么现象? (单色光的波长约为5×10^-7m)

—Hi, Mrs. Green How was your trip to the United States?

—It was wonderful____

—____

—I was there for a month.

—Great.____

—Yes, it's a wonderful and exciting city.

—____

—The city is the main business and cultural center in the Midwest It's famous for its music opera and theaters as well as for its excellent museums.

—____

—Yes, sure. What would you like to know?

关于日照自然环境的叙述错误的是（　　）