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Flood stands amongst the most devastating natural catastrophes. Almost everyone is well aware of its negative impacts on human such as loss of human life, damage to property, destruction of crops, loss of livestocks, and deterioration of health conditions owing to waterborne diseases. However, flood can also have some positive impacts on the environment. In many natural systems, floods play the key role in maintaining the ecosystem functions and biodiversity. They link the river with the land surrounding it, recharge ground water systems and fill wetlands. Moreover, floodwater often carries both sediment and nutrients, so it helps enrich the land. For many species, flood trigger breeding events, migration, and dispesal. The environmental benefits of flooding can also help the economy through things such as increased fish production, recharge of groundwater resourses, and maintainance of recreational environments. While cycling of sediments and nutrients is essential to a healthy ecosystem, too much sediment and nutrient in a waterway lowers the downstream water quality. Other negative effects include loss of habitat, dispersal of weed species and the release of pollutants such as chemicals, heavy metals and debris. These can degrade aquatic habitats, lower water quality, reduce coastal production, and contaminate coastal food resources.

What does the passage mainly discuss?

Read the passage and answer the questions

In Australia most children attend primary school from the age of five. Only two percent of children of primary school age are educated at home. Some children who go to school also take upextra activities such as learning to play a musical instrument or dancing, and they go to private classesfor these and for school subjects they find difficult or particularly interesting. Ninety percent of thepopulation go on to secondary school, but a much smaller percentage pass the final year of secondary school examinations and complete a university degree. At the moment university students andgraduates make up less than a third of the total population. Australian universities are modern andwell equipped. Most teaching is by a combination of lectures, tutorials and practical classes. The humanities course like History and Philosophy, usually involve a lot of extra reading in the library. To become a primary or secondary school teacher, it is usually necessary to study at university for three years or more.

When do children in Australia go to school?

She is overweight because she eats too much meat.

Tìm lỗi sai: My younger brother has worked in a bank since a long time.

Find a mistake and correct it:

We left our luggage at the station and go to find something to eat.

Tìm lỗi sai và sửa: When our vacation, we plan to spend three days scuba diving.

Find one mistake in each following sentence.

If there isn’t enough food, we couldn’t continue our journey.

Friend’s family has suffered from his ______. EXPEND

Josh is the second (intelligent) student in his class.

Find the mistake

If (A) you do not understand (B) what were written (C) in the book, you could ask (D) Mr. Pike.

All flights had to be cancelled as a result of the pilots’ sudden strike. (so)

Tokyo and Yokohama were struck by a disastrous earthquake in 1923.

=> The cities ______.

Anna has a job as a personal assistant, her main role is to ___ her boss.