单项选择题

Questions 5 to 7 will be based on the following news item.

A．Oxygen.
B．Ancient weather.
C．Carbon dioxide.
D．Temperature.
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单项选择题
A．It suffered a severe system failure at 13,000 feet.B．It was for the Russian Republic of Dagestan.C．It carried 150 people.D．It managed to land down safely.
A．It suffered a severe system failure at 13,000 feet.
B．It was for the Russian Republic of Dagestan.
C．It carried 150 people.
D．It managed to land down safely.
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