2. What’s the closest planet to the sun?

They are studying the Solar System’s_____planet, Saturn, and its moons.

It's our duty to preserve the planet for future（） A: persons B: generations C: characters D: natio

P115-3Welcome to Save the Planet where we talk about the world’s __________________. Now, did you know there are ________________ people on the planet, and by ________ there might be ____________________? People are living longer and healthier lives than ever before, but a big ______________ means big____________________ for the planet.

There could be life on the Mars in the future if（） A: it supported life in the past B: certain gases are used to cool the planet C: the atmosphere can be heated enough to grow simple plants D: the planet’s volcanoes become as active as they were in the past

Which planet is the closest planet to the sun, Mercury, Mars, Venus or Jupiter

It seems to the writer that Bob Dylan’s is steeped in allusion. A: The Basement Tapes B: Planet Waves C: Self Portrait D: John Wesley Harding

Mars is the _____ planet from the Sun.

Mercury is the brightest planet in the sky.

Pluto, the outermost planet of the solar system, ( ) photographically in March 1930. Pluto, the outermost planet of the solar system, ( ) photographically in March 1930.