找考题网-背景图
单项选择题

A.upgraded in reliability and safety. B.reduced in size……

Question 13 is based on the following news. At the end of the news item, you will be given 15 seconds to answer the question. Now listen to the news.()



A.upgraded in reliability and safety.
B.reduced in size and number.
C.dismantled partly later this year.
D.maintained in their present conditions.