单项选择题A.Travelled seven years to the surface of Titan.B.Travelled from one planet to another for more than seven years.C.Transmit registering datum to the Earth.D.Transmit registering datum to Cassini spaceship.
单项选择题A.To clean the yard.B.To hire a gardener.C.To weed the garden.D.To work in the flowerbeds.