(____) What does your mother do?
(____) Oh, great!
(____) She's a nurse.
(____) Look! This is my mother.
(____) Oh! She's beautiful.
读拼音,写词语。
bà ba
mā ma
yé ye
nǎi nai
____
(Ⅰ)求证:数列logman=2n+2,{an}是等比数列;
(Ⅱ)若bn=anf(an),记数列{bn}的前n项和为Sn,当m= 2 时,求Sn.
被誉为“裸子植物的故乡”的国家是()