设等差数列aπ的公差为d，前n项和为sπ，等比数列bπ的公比为q．已知b1=a1，b2=2，q=d，
（Ⅰ）aπ=2n-1<
Jane：Tom , a boy is in the classroom (教室) . Can you guess who he is?
Tom：OK. A boy? ____
Jane：Yes , he is very tall.
Tom：Does he have blond hair?
Jane：No, ____
Tom：Black hair? ____
Jane：That's right. He has a wide mouth.
Tom：____
Jane：Yes , he has big eyes and a big nose.
Tom： ____
Jane：Yes, you're right.
A. his hair is black.
B. Are his eyes big?
C. Is he tall?
D. Is his mouth wide?
E. Oh, I think he is Jim.
根据图片写出对应的声母
①____
②____
③____
④____
某同学对下列4个实验都设计了两种方案，其中方案一、方案二都合理的是（ ）
选项
A
B
C
D
实验目的
除去碳粉中少量的氧化铜
证明长期露置的氢氧化钠溶液已变质
鉴别碳酸钠和碳酸氢钠
证明稀醋酸溶液呈酸性
方案1
加稀硫酸
加足量稀盐酸
看外观
加无色酚酞溶液
方案2
高温灼烧
加澄清石灰水
加热
加氢氧化钠溶液
选择正确的读音。
de dí dì
的____确 目的____ 好的____
