Alibaba was founded in 1999 by Ma Huateng. Jack Ma, originally an English teacher in Hangzhou, established his e-commerce company with a team of 18 people.
【单选题】The problem of the American robin is an example of the hidden dangers involved in the use of insecticides. Elm trees in the United States, like those in Europe, are being attacked by Dutch elm disease...
A.
the side effects of insecticides may be serious and hard to predict
B.
the robin is near extinction in some parts of the world
C.
American scientists have succeeded treating Dutch elm disease