单项选择题

18（）

A．immediately
B．quickly
C．suddenly
D．sooner

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单项选择题From the passage we can infer that （）.

A．to get a visa is a new requirement for American citizens visiting other countries
B．it"s easier for American citizens to get a visa from a foreign country than at home
C．requirements for American citizens going abroad are not always fixed
D．American citizens usually have difficulty getting a passport

单项选择题17（）

A．dropped
B．drop
C．dropping
D．drops