Questions 7 and 8 are based on the following news. At the end of the news item, you will be given 20 seconds to answer the questions. Now listen to the news. The key issue in the reported investigation is

A．whether similar cases could have occurred.
B．how the computers could have been sold to Russia.
C．why Moscow offers to move them to new locations.
D．if they are being used in Russia’s nuclear programme.