Unit 4 World of the Future(9)

Unit 4 World of the Future

mental arithmetic: the act of adding numbers together, multiplying them, etc. in your mind, without writing them down

skate n. & v.

1) n. one of a pair of boots with metal blades on the bottom, for moving quickly on ice

Ice skates were only a $74 million business

2) v. to move on skates

The children skated on the frozen pond.

Collocation:

ice skate: one of a pair of boots with metal blades on the bottom, for moving quickly on ice

roller skate: one of a pair of boots or frames with small wheels on the bottom, for moving quickly

on flat smooth surfaces

Practice：

Explain the following expressions:

1) be skating on thin ice

to be doing something that may get one into trouble

2) get your skates on

used to tell someone to hurry

telepathy n.

the communication of thoughts between people’s minds without speaking

Psychic gifts, such as telepathy, are rare abilities.

Derivation:

telepathic adj.

helmet n.

a hard hat to protect the head

Tom had never before ridden pillion on a motorbike, but Andy the neighbor had a spare crash

helmet.

tune in

1) to realize or understand what is happening or what other

people are thinking

Try to tune in to your partner’s needs.

2) to watch or listen to a broadcast on radio or television

People get their information by tuning in to radio stations.

Collocation:

tune up: when musicians tune up, they prepare their instruments to play at the right pitch

tune out: to ignore or stop listening to someone or something

Practice:

Fill in the blanks with proper prepositions:

1) The band were tuning _________ their guitars.

2) A bored child may simply tune _________.

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