单项选择题

From the selection, we may conclude that ______.

A．spiders have adapted to many unlikely environments
B．on the whole spiders are delicate creatures
C．a species of black spiders can live anywhere
D．spiders are the greatest marvel of natural science

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单项选择题

The selection says that spiders have been discovered ______.

A．five miles above earth
B．more than 2000 feet underground
C．everywhere that man has reached
D．both A and B

单项选择题

What is the main idea of this passage

A．How Debbie, a divorcee, raises her two children.
B．How Debbie manages to do her work well.
C．How Debbie feels both as a responsible mother and a devoted worker.
D．How Debbie tries to be a single mother.