单项选择题

A．Two.
B．Three.
C．Four.
D．Six.
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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.
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.
A．To clean the yard.
B．To hire a gardener.
C．To weed the garden.
D．To work in the flowerbeds.
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