This passage gives an introduction of ______.

单项选择题A．$ 5B．$ 15C．$ 30D．$ 250

单项选择题A．To warn of dangers.B．To explain traffic regulations.C．To wake up drivers who are falling asleep.D．To give directions.

单项选择题A．Money.B．Ships and planes.C．Florida.D．Trains and cars.

填空题extremely

填空题The icebergs are rarely seen because ______.

单项选择题A．An English reporter.B．An American reporter.C．An English scientist.D．An American scientist.

单项选择题A．A chemistry class.B．A biology class.C．A mathematics class.D．A physics class.

单项选择题A．Her phone number.B．The location of the apartment.C．The best time to call her.D．Her first nam

单项选择题A．A bomb explosion.B．A traffic accident.C．Murder.D．Massacres.

单项选择题A．Something in the Bermuda Triangle is strange.B．Where the Bermuda Triangle is.C．On very little about this.D．Ships were not lost.