根据短文内容,选择最佳答案。
B
Preparation is the key to successful travel. In order to have a pleasant trip, you must prepare well before you start off. The most important thing you should do is to pack(把东西装入) your bags with useful things.
About all, ★. For example, if you travel to another country, you must remember to take your passport with you. You should also take clothes that are suitable for the climate, such as a sweater, a swimsuit, a raincoat and suitable shoes. One more thing, never forget to take some medicine with you in case (以防) you get sick.
In addition to these things, you should remember to take a camera so that you can take pictures of the places you visit. To keep in touch with your family and friends, you should carry a cell phone, too. It would also be good to carry a directory with all your family's and friends' telephone numbers in it. That way, if something goes wrong with your cell phone, you can still get in touch with them by using a public telephone.