单项选择题

Questions 18 to 20 are based on the following passage. ______is the driving force of the formation of a typhoon.

A. Water
B. Heat
C. Air
D. Wind
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单项选择题
Vietnam signed an agreement with the United States to
A. develop its agriculture.
B. develop nuclear weapons.
C. get investment from US companies.
D. meet its energy demand.
单项选择题
What is the theme of the summit
A. Economy of the United States.
B. Government spending.
C. World’s financial future.
D. World’s political crisis.
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