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单项选择题

A．He was so pleased that he wanted to share the mushroom with it.
B．The dog would enjoy the mushroom.
C．He liked the dog very much.
D．He was afraid of mushroom poisoning and wanted to test the mushroom by the dog.
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单项选择题A．Trade unions in Britain are becoming more popular.B．Most strikes in Britain are against the British law.C．Unofficial strikes in Britain are easier to deal with now.D．Employer— worker relations in Britain have become tenser.

A．Trade unions in Britain are becoming more popular.
B．Most strikes in Britain are against the British law.
C．Unofficial strikes in Britain are easier to deal with now.
D．Employer— worker relations in Britain have become tenser.

单项选择题A．Such strikes are against the British law.B．Such strikes are unpredictable.C．Such strikes are more difficult to control.D．Such strikes are very common these days.

A．Such strikes are against the British law.
B．Such strikes are unpredictable.
C．Such strikes are more difficult to control.
D．Such strikes are very common these days.

单项选择题A．They often take place in her major industries.B．British trade unions are more powerful.C．There are more trade union members in Britain.D．Britain loses more working days through strikes every year.

A．They often take place in her major industries.
B．British trade unions are more powerful.
C．There are more trade union members in Britain.
D．Britain loses more working days through strikes every year.

单项选择题The author's assertions concerning the conditions that lead to the decay of the vacuum would be most weakened if which of the following occurred

A．Scientists created an electric field next to a vacuum, but found that the electric field was not intense enough to create a charged vacuum.
B．Scientists assembled a super heavy atomic nucleus next to a vacuum, but found that no virtual particles were created in the vacuum's region of space.
C．Scientists assembled a super heavy atomic nucleus next to a vacuum, but found that they could not then detect any real particles in the vacuum's region of space.
D．Scientists introduced a virtual electron and a virtual positron into a vacuum's region of space, but found that vacuum did not then fluctuate.

单项选择题According to the passage, the author considers the reduction of energy in an empty region of space to which a real particle has been added to be

A．a well-known process.
B．a frequent occurrence.
C．a fleeting aberration.
D．an unexpected outcome.