—You can read English newspapers.
A:improve
B:improving
C:improved
D:to improve
— May I speak to Mrs. Black?
— Sorry, mum can't come to the phone now. She a shower.
《神奇的极光》在“极光的来龙去脉”部分里则是____介绍极光的物理性,形成的条件、原理及“极光也还有许许多多没有解开的谜”收束全文,是读者理性地认识、了解极光。