下列有关实验操作、现象或结论的叙述正确的是 A．乙醇的催化氧化实验中铜丝主要起氧

传统的食品保存方法：_____、_____、_____、_____、______、_______等。现代方法：_______、______、________、__________、__________等，目前已广泛利用_____对食物进行保存，例如利用______对鱼虾等水产品的保存。

下列哪一项是治疗银屑病的首选方法（）。

A.红外线

B.长波紫外线

C.中波紫外线

D.短波紫外线

E.电脑中频

下面错误的是（）。

A.半抗原可被抗体所识别

B.抗原是指能被T细胞或B细胞所特异性识别的分子

C.特异性抗体是结合整个抗原，而不是仅结合抗原表位

D.抗原决定簇是抗原上能与特异性抗体结合的化学基因

E.异嗜性抗原是共同抗原的一种

The price of crude oil hit an all-time high early in April. The surge in oil price harms virtually all consumers and industries.
Nevertheless, according to Wharton finance professor Jeremy Siege, record high prices are not as bad as they look. "The major reason for that is we have become much more energy efficient."

Topic: The rising price of oil

Questions for Reference:
1. What are the advantages and disadvantages of the rising price of oil on the economic development
2. Why does the price of oil fluctuate What can we do to reduce the negative effects to the least
3. What does Prof. Siege mean when he says we are more energy efficient

漂浮烟雾信号将信号罐抛入上风舷水中或持在手中，让其发烟漂浮。（）