Which of the following is the main cause of global warming？
A. Fossil fuel.
B. Greenhouse gases.
C. Increased dryness.
D. Violent storm patterns.
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According to the news item, the threatening packages were sent from
A. the United States.
B. Dubai.
C. Yemen.
D. Chicago.
All of the following statements are true about those children involved in political violence EXCEPT
A. some of them planted bombs for money.
B. half of them could still go to school.
C. some of them were used as decoys.
D. some of them often lost their lives.
Besides attracting more tourists, the plan will also provide the authorities with more opportunities to
A. check the travelers" pets" physical state.
B. perfect the online checking service.
C. protect the travelers" personal data.
D. check the travelers" detailed information.
在引导模式下，司机应当在每60s之内或运行()按下警惕键，否则列控车载设备将触动紧急制动。
A. 300m
B. 300m以前
C. 200m以前
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