题干

填入横线的语句,与上下文衔接最恰当的一项是(     )
雁阵之美,在于它能给现实生活提供哲思。有研究表明,雁阵飞行的速度能比单雁提高22%,因为飞行中雁的两翼可形成一个相对的真空状态;头雁没有真空,无法讨巧,但却是不停轮换的。       ,这确实值得作为思想群体的人类深思。

A:为了团队共同的目标勇于牺牲自我

B:雁阵里每一个成员能配合得如此之好

C:人类与我们的大自然应怎样和谐相处

D:任何团队总有一个精明的领导者

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答案(点此获取答案解析)

B

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    Are you dreaming of taking a trip on your own? Here is some advice on how to make your once-in-a-lifetime journey and how to stay safe when you get there.

    Before you begin to look at places, activities and plane tickets, you must set a budget. When you search through the websites about travelling, it can be so easy to add another week here or there, or choose an extra activity. Setting a budget can avoid(避免) creating a huge bill, which starts very small.

    With so many countries on this planet, it is difficult to decide where to go. By narrowing down your search to voluntary (自愿的) work or a relaxing holiday, you can save a lot of time looking through websites.

    After deciding where to go, you need to research the country. Find out when each season is. It would be disappointing if you were taking part in an outdoor-based activity and it rained most days. Look into medical information, as you may need certain medicine for certain countries. Above all, make sure you can afford to go to this country and take part in the activities you have dreamt about. Don't raise your hopes too high before you know for certain it is within your budget.

    By carrying a credit (信用) card with you at all times,  it is possible to stop yourself getting lost. Mobile phones are very important as well. However, do not depend completely on them, since electronic machines can break without warning. Therefore, always carry a list of emergency (紧急情况) phone numbers, names and addresses. Finally, learn a little of the language. Do not expect that the people there speak your own language. After all, you are in their country.