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问题 填空题

tan1°tan2°tan3°…tan89°=______．

答案

tan1°tan2°tan3°…tan89°

=（tan1°?tan89°）（tan2°?tan88°）…（tan44°?tan46°）?tan45°

=1．

单项选择题

根据对流浪乞讨人员实施救助的有关规定，救助站的救助对象是( )。

A．在城市流浪乞讨的人员

B．在城市生活无着的流浪乞讨人员

C．公安机关和其他行政机关的工作人员在执行任务时发现的流浪乞讨人员

D．向救助站提出求助的流浪乞讨人员

E．向救助站提出求助的在城市生活无着的流浪乞讨人员
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填空题


Health officials in western Siberia are to begin in slaughter of thousands of birds today after identifying Russia’s first outbreak of a bird flu strain that can be fatal in humans. Doctors in neighboring Kazakhstan have also (1) that a 19-year-old poultry worker (2) admitted to hospital with (3) of bird flu, only to be diagnosed (4) double pneumonia.
The H5N1 strain of avian (5) has killed 60 people (6) 2fib in Vietnam, Thailand, Cambodia and Indonesia, but has rarely been found in birds or humans (7) Asia.
Health officials (8) that HSN1 is infecting migrating birds, which could spread the (9) into Europe. Earlier this year China registered the first outbreak of H5N1 (10) wild birds, some of which (11) to breeding grounds in Siberia. These birds could come (12) contact with others flying to Europe and North America.
Russia’s (13) began in the Novosibirsk (14) , about 1,750 miles (15) of Moscow in the Asian part of Russia, early last month, but the veterinary service (16) the virus only last week. Valery Mikheyev, the chief sanitary doctor of Novosibirsk, said that teams had been (17) the (18) birds and supervising the slaughter in13 (19) villages. He said, "The state of (20) of the inhabitants of these areas gives (21) cause for alarm. Up to 6,000 people are being (22) per day.
The virus seems to have (23) only private farms that let (24) mix with wild birds. Further outbreaks were registered in the Omsk and Altai regions, but the strain had (25) to be determined, Russia’s Emergency Situations Ministry said.
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