The magnetic field lines are ( ) curves,The<br/>outer space magnetic field line of the permanent magnet is ( <br/>). <br/>A.close-loop/ A: ). <br/>close-loop/<br/>from B: pole<br/>open-loop/<br/>from C: pole<br/>close-loop/<br/>from D: pole to E: pole to F: pole to G: pole to H: pole<br/>open-loop/<br/>from I: pole

The North Pole is surrounded by land, while the South Pole is surrounded by the Antarctic Ocean. So scientists thought that______. A: most of the ice melted in the Northern hemisphere B: most of the ice melted in the Southern hemisphere C: The North Pole is colder than the South Pole D: The South Pole is colder than the North Pole

Like the island continent of America, Australia is located entirely in (). A: the Northern Hemisphere B: the Southern Hemisphere C: the North Pole D: the South Pole

Despite the fact that the South Pole is as snow-covered and stormy-weathered as the North Pole, is colder than the North Pole. A: Despite the fact B: as snow-covered C: as D: is colder

When did the speaker swim across the North Pole?

The_____ is one of the necessary instruments in the North Pole exploration.

Give the Chinese equivalent to the following term.the North Pole

He would be able to reach the Pole _____ was 300 miles away.

中国大学MOOC: there is a wire pole along the road _____ meter.

a working model A: mock-up B: data link C: wire pole link