题干
—Dinner is ready. Help yourself!
—Wow! It ______ delicious. Could you please tell me how to cook it?
—Wow! It ______ delicious. Could you please tell me how to cook it?
A：taste
B：look
C：sound
D：Feel
答案(点此获取答案解析）
A
是公差为
（
）的无穷等差数列
的前
项和，则下列命题错误的是（ ）
=
，∠ABC=45°，求OH的长．
