艾滋病病毒传播途径有以下三条：性接触传播、（）和母婴传播。
A. 身体接触
B. 接吻
C. 血液传播
D. 空气传播
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列车车门验票由列车员负责，列车内的验票工作由列车值班员、乘警等有关人员配合实施。（）
A. 正确
B. 错误
The ping loopback hangs with no output. Which of the following is the most likely cause？（）
A. The loopback interface is down and resolv.conf is configured.
B. The loopback is not in /etc/hosts and resolv.conf is configured.
C. The loopback interface is down and resolv.conf is not configured.
D. The loopback is not in /etc/hosts and resolv.conf is not configured.
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