Match the beginnings and the endings of the sentences

Give English equivalents to the following word combinations.

Working with word combinations and sentences

Choose the correct word to complete the sentences.

Match a word in A to its definition in B.

Make word combinations using the following words.

Word building.

Working with words

noun	verb	adjective
		simple
	to radiate
likeness
	to appear
		developing
	to form
creature, creation

complex, outboard, ozon, fertilizied, modern, bright, arctic, slime, fresh, upper, direct, thin, stem, jet, powerful, main, visible

cell ice layer motor sunlight

A		B
	boil	a	to move forward
	radiation	b	creature, similar to snail, but it has no shell
	to propel	c	a form of energy produced during a nuclear reaction
	slug	d	to move in a circle around a fixed central point
	stationary	e	the central part of a living cell, containing chromosomes
	nucleus	f	to heat liquid until it has bubbles and starts to become a gas
	rotate	g	things used for writing

gaseous advantage activity primary decomposition atmosphere metabolism nutrients available environment contained depends rely on

The ecosystem, both on land and in the water, ................ heavily upon the activity of bacteria. The cycling of ....................... such as carbon, nitrogen, and sulfur is completed by their hard labor.

When organisms die, the carbon ...................... in their tissues becomes unavailble for most other living things. ........................... is the breakdown of these organisms, and the release of nutrients back into the ..............................., and is one of the most important roles of the bacteria.

The cycling of nitrogen is another important ......................... of bacteria. Plants ..................... nitrogen from the soil for their health and growth, and cannot acquire it from the gaseous nitrogen in the .............................. The .......................... way in which nitrogen becomes.............................. to them is through nitrogen fixation by bacteria such as Rhizobium and by cyanobacteria. These bacteria convert .............. nitrogen into nitrates or nitrites as part of their....................................., and the resulting products are released into the environment. Some plants, such as liverworts, have taken special .................................. of this process by modifying their structure to house the bacteria in their own tissues.

Кажущаяся простота, выше точки кипения, всплеск радиации, отделение клетки, миллиарды лет, поселиться, жерло вулкана, чайная ложка плодородной почвы, жидкая окружающая среда, изменить направление, вращать флагеллами, слизистый слой, выделять кислород.

	Tiny, one-celled organisms called bacteria	a	on the head of a pin.
	Most of these organisms can be seen	b	do cause sickness.
	Millions of them would fit	c	live on, in, and around human beings.
	The study of bacteria	d	there would be no plant or animal life on the Earth.
	It is true that many of bacteria	e	the spoilage of food.
	Others are responsible for	f	are helpful to humans.
	Many other types of bacteria, however,	g	is called bacteriology.
	Without bacteria there would be	h	only with the aid of a microscope.

Дата добавления: 2014-01-04