读一读,连线。
① How are you?____ A. You're welcome.
② Are you hungry?____ B. Thanks, Kitty.
③ I am very sad.____ C. I'm thirsty and tired.
④ Thanks, John.____ D. Yes, I am.
⑤ Please have some water.____ E. Because(因为) I can't see my bike.
如图,在长方体ABCD﹣A1B1C1D1中AA1=AD=1,E为CD中点.
求证:B1E⊥AD1
读下列古诗,按要求答题。
润州听暮角① (唐)李 涉 江城②吹角水茫茫,曲引边声怨思长。 惊起暮天沙上雁,海门斜去两三行 【注】:①文宗时,诗人曾被流放康州,此诗很可能是作于迁谪途中。②江城:临江之城,即润州。
(Ⅰ)求f(x)≥11的解集;
(Ⅱ)设函数g(x)=k(x﹣3),若f(x)>g(x)对任意的x∈R都成立,求实数k的取值范围.