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【简答题】
（5分）右图实验装置，既可用于制取气体，又可用于验证物质性质。 （1）甲同学利用I、Ⅱ装置进行的实验是 (填序号)。 ①锌与稀硫酸反应制取氢气 ②过氧化氢与二氧化锰混合制取氧气 ③大理石与稀盐酸反应制取二氧化碳 （2）利用I、Ⅱ装置进行过氧化钠 (Na 2 O 2 )固体与水反应制取氧气并测定其体积的实验，该反应的另一产物为氢氧化钠，反应的化学方程式为 ，为达到该实验目的，如何改进装置 。 （3）丙同学利用I、Ⅲ装置进行“硫燃烧现象及酸雨危害模拟实验”。 实验操作步骤：①连接仪器，装好药品；②将玻璃棒下端在酒精灯上烧红，迅速伸入中点燃硫粉；③向锥形瓶中注入双氧水；④硫粉完全燃烧后，用注射器向中喷水。 实验过程中观察到的现象是 。 实验结束时，用注射器向装置Ⅲ中注入NaOH溶液以吸收剩余的SO 2 气体。
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【简答题】阅读理解. A man has a cat. He likes her very much. At mealtime the cat sits at the table with him. The man eats with a knife and a fork, but the cat eats from her own plate. Sometimes, when she finishes h...
【单选题】Refer to Exhibit 14-4. Based on the diagram above, one can surmise that:
A.
new firms will enter the blue jeans industry.
B.
existing firms will exit the blue jeans industry.
C.
the industry is in long-run equilibrium.
D.
blue jeans will be produced at minimum average total cost.
【简答题】A man has a cat. He likes her very much. At mealtime the cat sits at the table with him. The man eats with a knife and a fork, but the cat eats from her plate. Sometimes, when she finishes her dish, h...
【单选题】'The quintet’s name' (Line 3, Para. 3) most probably means
A.
the name of a five-member group.
B.
the name of an outstanding group.
C.
the name which will soon become popular.
D.
the name which will never be forgot.
【单选题】Refer to Exhibit 14-5. To maximize profit (or minimize losses), the firm will charge:
A.
$38 per sweater.
B.
$44 per sweater.
C.
$50 per sweater.
D.
$56 per sweater.
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