单项选择题

Questions 11 to 14 are based on the following passage. At the end of the passage, you will be given 10 seconds to answer the questions. Now listen to the passage. What happened on October21, 1833

A．Alfred Nobel invented dynamite.
B．Alfred moved to Russia.
C．Alfred was born in Stockholm.
D．Alfred died in a foreign country.
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单项选择题
We can infer from the passage that _________.
A．the company producing these drugs are going to pull from the market all their products.
B．customers don't know the results of the trail.
C．doctors are strongly against using these drugs on their patients.
D．researchers are worried about the adverse events of these drugs.
单项选择题
Which of the following drug is reported to be able to prevent colon cancer
A．COX-2.
B．Rofecoxib.
C．Celebrex.
D．Bextra.
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