在燃气设施保护范围内，不准进行爆破、取土等作业。()
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燃气管道及设施禁止拉绳挂物的原因是会使燃气管道移位、受损、歪斜而造成断裂、漏气，引发火灾、爆炸等事故。()
What will happen in future decades？
A. The population of interracial Americans will be three times in 2050 as much as now.
B. There will be no dominant races in America.
C. The divisiveness of the nation is an inevitable problem to confront.
D. At least 50 percent of the third-generation African Americans will marry other ethnic groups.
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