单项选择题

According to Obamas advisers，（）

A.great actions should be taken.
B.president’s action on business is a show.
C.doing is more than saying.
D.Larry Summers should be fired.

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单项选择题

According to the researchers，what should doctors do to treat diseases like HIV？（）

A.Develope new drugs to avoid resistance.
B.Stop using drugs when the patient’s condition allows.
C.Use different drugs in turn during the treatment.
D.Change the combination of drugs from time to time.

单项选择题

Why the Preventive Service Task Force was involved in a controversial issue in 2009？（）

A.Because it said that early detection of breast cancer was not accurate enough.
B.Because it warned that middle-age women are of high risk of breast cancer.
C.Because it found that early detection of breast cancer may cause some harm.
D.Because it only looked at the special age group of 40s.