15．The World Health Organization（WHO） has reported warnings about the A/H1N1flu（流感） by raising its alert level．By May 7，the WHO reported a total of 1，893confirmed cases（確診病例） of human infection（感染） in 23countries and regions，including 31deaths．China will communicate with the WHO and take measures to prevent the outbreak of the A/H1N1flu on the mainland．
On May 18，a reporter from CCTV interviewed Shu Yuelong，Director of the Chinese National Influenza Center，after it got the first A/H1N1flu virus sample （病毒樣本） from an imported case （輸入病例） on May 17．This first virus sample was taken from a patient from Sichuan Province．Shu Yuelong said，"All the cases we have now are being imported．We want to know whether the virus in our cases is the same being seen in other countries．After getting this virus sample，we worked overnight to test it．We found it similar to samples gotten in the United States and Canada．We can say they are the same virus or the same type of virus．The virus does not mutated（變異） after spreading to China．But we cannot say for sure that it won't mutate after entering China．So we have to continue our work of virus testing．"
Health experts say that the symptoms（癥狀） of the A/H1N1flu are similar to those of the regular flu，including headaches，coughing and fever．They suggest that people with cold symptoms should take a rest at home．When symptoms become serious，people should go to a hospital．They also suggest that people should stay away from crowds to avoid the possibility of virus infection．
根據(jù)短文內(nèi)容，完成下列小題．
87．What's the passage mainly about？the A/H1N1flu
88．Where was the first A/H1N1flu virus sample taken from in China？Sichuan Province
89．Are the experts sure that the virus won't mutate after entering China？No，they aren't．
90．What do the symptoms of the A/H1N1flu include？Headaches，coughing and fever．
91．What should you do if you have a bad cold according to health experts'suggestions？Go to hospital．
