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ksorkhem
2 năm trước
Dangerous chemicals can be ................. from burning plastics or hairspray containers.
A.freed
B.invented
C.released
D.escaped
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Read the following passage and mark A, B, C or D on your answer sheet to indicate the correct answer for each of the questions
Coincident with concerns about the accelerating loss of species and habitats has been a growing appreciation of the importance of biological diversity, the number of species in a particular ecosystem, to the health of the Earth and human well-being. Much has been written about the diversity of terrestrial organisms, particularly the exceptionally rich life associated tropical rain-forest habitats. Relatively little has been said, however, about diversity of life in the sea even though coral reef systems are comparable to rain forests in terms of richness of life.
     An alien exploring Earth would probably give priority to the planet's dominants - most distinctive feature - the ocean. Humans have a bias toward land that sometimes get in the way of truly examining global issues. Seen from far away, it is easy to realize landmasses occupy only one-third of the Earth’s surface. Given that two thirds of the Earth's surface is water and that marine life lives at all levels of the ocean, the total three-dimensional living space of the ocean is perhaps 100 times greater than that of land and contains more than 90 percent of all life on Earth even though the ocean has fewer distinct species.
     The fact that half of the known species are thought to inhabit the world's rain forests doesn't seem surprising, considering the huge numbers of insects that comprise the bulk of the species. One scientist found many different species of ants in just one tree from a rain forest. While every species is different from every other species, their genetic makeup constrains them to be insects and to share similar characteristics with 750,000 species of insects. If basic, broad categories such as phyla and classes are given more emphasis than differentiating between species, then the greatest diversity of life is unquestionably by sea. Nearly every major type of plant and animal has some presentation there.
     To appreciate fully the diversity and abundance of life in the sea, it helps to think small. Every spoonful of ocean water life, on the order of 100 to 100,000 bacteria cells plus assorted microscopic plants and animals, including larvae of organisms ranging from sponges and corals to starfish and clams and much more.
The author argues that there is more diversity of life in the sea than in the rain forests because
A.more phyla and classes of life are represented in the sea
B.many insect species are too small to divide into categories
C.there are too many insects to make meaningful distinctions
D.marine life-forms reproduce at a faster rate

Fill in each numbered blank with one suitable word.
In Britain there is a holiday now which people call Mother’s Day. In the old days many girls from working-class _______(1) in towns and cities and from farmers’ families in the country worked in rich houses. They had to do all the______ (2) and their working day was usually very long, they often______ (3) on Sundays, too. Once a year, it was usually______ (4) Sunday in March, they could visit their mothers. They went home on that day and_______ (5) presents for their mothers and for ______(6) members of their families. They could stay at home only one day, and then they went_____ (7) to their work. People call that day Mothering Day ______(8) Mothering Sunday.Later workers at the factories and girls_______ (9) worked in the houses of rich families received one free day a week, and Mothering Day became Mother’s Day. It is______ (10) last Sunday in March.
_____(7)
A.back
B.to
C.by
D.with

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