According to the text, the Animal Liberation Front (ALF) is one of the most extreme animal-right advocate organizations because
A. it has caused more than 1,200 violent acts since 1900
B. it carried out a booming act in Cambridge, Massachusetts, near Boston
C. it has caused millions of dollars damage
D. all of the above
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Without animal testing, human would not have mastered so much knowledge about medicine.
A. 对
B. 错
The animal testing cannot pioneer effects that are advantageous to the heath of individuals.
A. 对
B. 错
People can understand more about the animals and human being itself by animal testing.
A. 对
B. 错
Millions of people were killed by smallpox and rabies before the 20th century because there was no cure for these diseases.
A. 对
B. 错