单项选择题

Questions 19 to 21 are based on the passage you have just heard.

A. An insect-killing poison.
B. Snow.
C. A layer of oil.
D. A black dye.
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单项选择题
A. Complete unfinished projects.B. Practise techniques he has learned before.C. Teach less advanced students how to use acrylic paints.D. Learn how to apply paints with different kinds of brushes.
A. Complete unfinished projects.
B. Practise techniques he has learned before.
C. Teach less advanced students how to use acrylic paints.
D. Learn how to apply paints with different kinds of brushes.
单项选择题
A. Animals were hurt by the black snow. B. Pollutants are dangerous to people and animals. C. A black snow of harmful pollutants fell on a town in Sweden. D. Natural cycles of wildlife.
A. Animals were hurt by the black snow.
B. Pollutants are dangerous to people and animals.
C. A black snow of harmful pollutants fell on a town in Sweden.
D. Natural cycles of wildlife.
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