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有4种钠的化合物W、X、Y、Z，它们之间存在如下关系： ①W X+H 2 O+CO 2 ↑ ②Z+CO 2 →X+O 2 ③Z+H 2 O→Y+O 2 ↑ ④X+Ca(OH) 2 →Y+CaCO 3 ↓ 请回答下列问题： (1)W、X、Y、Z的化学式分别是：W____、X____、 Y____、Z____。 (2)以上4个化学反应，属于氧化还原反应的是_____（填反应序号），反应中氧化剂是______（写化学式），还原剂是______（写化学式）。 (3)若④反应在溶液中进行，写出其离子方程式以及能用该离子方程式表示的另一个化学反应的化学方程式：①离子方程式________________。②化学方程式__________________。
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【简答题】设 , 为随机变量,已知协方差 ,则 ____.
【简答题】The more (argue) ______ you win, the less friends you will have.
【单选题】The more you argue with him, __________.
A.
the more little notice does he take
B.
the more little notice he takes
C.
the less notice he takes
D.
the less notice does he take
【单选题】听力原文：W: Why are you leaving Burchester, John? M: To make more money. W: You have a good pub here. M: The trade's better in Haworth, the home of the Bronte sisters. It is an important tourist centre. W...
A.
He is a book salesman.
B.
He is a tourist guide.
C.
He is a pub owner.
D.
He is a novelist.
【单选题】The more you argue with him, ______.
A.
the less notice he takes
B.
the less notice does he take
C.
the more little notice does he take
D.
the more little notice he takes
【简答题】根据句意用 should 或 shouldn't 填空。 1. You_________argue with your father any more. 2. If you want to be popular,you ___________ be friendlier. 3. Maybe you________ buy some new clothes. Funky Fashions is...
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