Vocabulary

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Wheels on this type of vehicle can retract
a. a bicycle
b. a station wagon
c. an airplane
d. a sailboat

I feel like I should know the answer to this, but I'm not sure. It can't be a bicycle or a station wagon. So would it be an airplane or a sailboat?

• Vocabulary -

http://dictionary.reference.com/browse/retract

• Vocabulary -

A sailboat?

• Vocabulary -

I've never seen wheels on a sailboat.

• Vocabulary -

An airplane?

• Vocabulary -

Right, after a plane gets off the ground, the wheels retract.

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