A:D和T
B:D和d
C:D和D
D:d和d
“少年安能长少年,海波尚变为桑田。”唐代诗人李贺的这一诗句体现了( )
有助于自信者成功的心理品质包括( )
①乐观 ②进取 ③激动 ④专注
(Ⅰ)求椭圆C的方程;
(Ⅱ)线段PQ是椭圆C过点F2的弦,且 PF2→ =λ F2Q→ .
(i)求△PF1Q的周长;
(ii)求△PF1Q内切圆面积的最大值,并求取得最大值时实数λ的值.
用所给词的适当形式填空
(1)Autumn is a____(wonder)season.
(2)We all hope____(have)a long holiday.
(3)I____(buy)a new car the day before yesterday.
(4)I like doing some____(shop)with my parents.
(5)He did some____(read)last night.