搜题请搜索小程序“爱下问搜题”
问题
判断题
社会保障是政府行为。 ( )
答案
参考答案：
错
选择题
Nobody knows how people first came to these islands. They _____ from South America on rafts.
A .must have sailed
B. can sail
C. might have sailed
D. should have sailed
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单项选择题
下列哪项是膳食中铁的较好来源( )
A．动物肝脏
B．蔬菜
C．豆类
D．稻米
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