单项选择题

Black people were first brought to America from Africa as ______.

A．workers in factories
B．cotton pickers
C．migrants
D．slaves
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单项选择题
The first settlement in Australia was made by the ______.
A．English
B．Dutch
C．French
D．German
单项选择题
The main reason why people fail to act when they stay together is that______.
A．they are afraid of emergencies
B．they are reluctant to get themselves involved
C．others will act if they themselves hesitate
D．they do not have any direct responsibility for those who need help
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