单项选择题

The earliest form of artificial lighting was fire, which also provided warm and protection.()

A. hot
B. sunshine
C. warmth
D. safe

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单项选择题
We should let more young parents and their children can enjoy scientific early education.
A. provide more young parents and their children to enjoy early education
B. provide more young parents and their children to enjoy early education and scientific
C. provide young parents and their children enjoy more scientific early education
D. provide young parents and their children with more early education services
单项选择题
A professor of economic and history at Atlanta University, W．E．B．Du Bois, promoted full racial equality.()

A. economy
B. economics
C. economical
D. economic
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