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