单项选择题

According to the passage, which of the following eighteenth -century developments had a strong impact on silversmiths

A．A decrease in the cost of silver.
B．The invention of heat efficient furnaces.
C．The growing economic prosperity of colonial merchants.
D．The development of new tools used to shape silver.

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单项选择题

Why Miran was not allowed to leave the Charles de Gaulle Airport

A．Because he is an Iranian.
B．Because he has no citizenship of France.
C．Because he is stateless,
D．Because he is a refugee.

单项选择题

Which of the following statements is TRUE according to the passage

A．The airport workers treated him friendly at first, but became indifferent later.
B．The officials finally found the lost document which could prove Miran' s state of refugee.
C．Miran tried hard to release himself from the airport but there was no possibility to leave.
D．Miran was allowed to leave the airport in 1999 and he started a new life since then.