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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】用于耐火防护的材料产品，应按等效工程使用条件的燃烧试验满足耐火极限不低于 1h的要求，且耐火温度不低于( )。
A.
100℃
B.
500℃
C.
1000℃
D.
2000℃
【单选题】B Hip-hop dancing(街舞) is popular with many young people today． They like it because they can invent their own moves． They use this dance to show their love for life． It also shows that they feel good ...
A.
it has a history of more than 20 years
B.
it first began in the U． S．
C.
they can invent their own moves
D.
many young black people often dance it