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 Writing

Task 1

Reading

why some plants fold their leaves at night?

1)Protection against cold (losing heat));

2)Protection against fungal spores infection, block out water so insects have meanings of fungal infection;

3)Eliminate nighttime light, in order to track up to the regular time to produce flowers.

Listening

1)The plants have no source of internal heating, so whether folding or unfolding suffer the same freezing damage;

2)Even though the plants are folding, they cannot block out all the water and fungal spores only require a few water;

3)Some plants in densely shaded area where no light is reaching still fold their leaves, therefore some other reasons may explain.

Task 2

Some people like to buy a piece of technological device as soon as it is available in the market. Other people prefer to buy it after many people have adopted it.

Which do you prefer?