What will Ms. Bush's trip probably be?
[A] Her home→Sydney→Cairo.
[B] Her home→Cario→Sydney.
[C] Cairo→Her home→Sydney.
[D] Sydney→Her home→Cairo.

单项选择题What is the speaker's main topic?[A] Training for a professional athletE.[B] His physical training.[C] How to do cross-country running.[D] How to do mountain climbing.

单项选择题有自然发火可能性的矿井，主要运输巷道应布置在（ ）内，并采用预防性灌浆或者其他有效的预防自然发火的措施。