The underlined (划线的) part in Paragraph 2 means long-term memory _______.
A:keeps many books like a large library
B:works like a well-organized library
C:provides any book you want
D:leaves memory anywhere
①火柴棒的长度是5 ____ 。 ②小名的身高130____。
③操场的跑道长度是400____。 ④一棵杨树高12____。
下列粒子可以通过得到电子变成原子的是( )