Part A
You will hear a lecture about shingles, an infectious disease. As you listen, answer Questions 1 to 10 by circling TRUE or FALSE. You will hear the talk ONLY ONCE.
You now have 1 minute to read Question 1 to 10.
Questions 1 to 10:

Shingles, also herpes zoster, is a disease caused by a virus with a band of painful spots on the skin especially around the waist.

（15分）A、B、C、D分别是NaNO₃、NaOH、HNO₃和Ba(NO₃)₂四种溶液中的一种，现利用另一种溶液X，用如图所示的方法可将它们依次确定

试确定A、B、C、D、X各代表何种溶液。A：______，B：______，C：_____， D：_____，X：_______。