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Activity 2Fill in the blanks with the proper forms of words given in the brackets.1. _______(social) is the foundation on which human societies are based.2. What a _________(terrify) experience!3. He took up_________(resident) in America.4. QUANJUDE Peking Roast Duck was one of the ________(theme) restaurants in China since1864.5. It is necessary to overcome _________(shy) at school.

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Activity 3Grammar: Fill in the blanks with the proper forms of words given in the brackets.1. They________(are) absent from school two days ago.2. I ________(buy) a gift for my mum yesterday.3. ________(plant) trees makes our environment better.4. ________(watch) too much TV does harm to our eyes.5. ________(not arrive) on time can be a form of avoidance.

空间上的点用()表示。

A. 小写字母
B. 大写字母
C. 数字
D. 字线加括号

以下表示看不见的点的是()。

A
B. b’
C. (c)
D. d”

何种物质在三羧酸循环过程中被氧化生成H2O和CO2?

A. 草酰乙酸
B. 柠檬酸
C. 乙酰CoA
D. 苹果酸
E. 丙酮酸

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