单项选择题

Learning from past failures，researchers realized the importance of（）

A.putting some inexpensive sensors in stoves.
B.focusing on how stoves are actually used.
C.cooperating with mobile-phone companies.
D.possessing laboratory data about how stoves work.

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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.

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.