单项选择题

A．Classmates.
B．Friends.
C．Lawyer and client.
D．Lifesaver and drowned victim.
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单项选择题
A．Spelling.B．Ideas.C．Whole words.D．Expressions.
A．Spelling.
B．Ideas.
C．Whole words.
D．Expressions.
单项选择题
A．Plants can produce some poisonous chemical for defence against insects.B．Insects have been eating plants for many million years.C．Insects have developed ways of dealing with poisonous chemicals produced by plants themselves.D．Insects have already developed some resistance to man-made poisons.
A．Plants can produce some poisonous chemical for defence against insects.
B．Insects have been eating plants for many million years.
C．Insects have developed ways of dealing with poisonous chemicals produced by plants themselves.
D．Insects have already developed some resistance to man-made poisons.
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