Saying no can be very difficult. People who are very shy often have little confidence.  They think that they have to meet everyone's need. It is very hard for them to say no. they sometimes feel shy if they say no, but doing things that they don't want to will make them unhappy.
A simple and direct “No” is the best way. If you want to explain, you can keep it simple. Just say, “No, I've already made plans for this time” or, “Sorry, I'm afraid I'm not free at that time.”
Other ways of saying no:
▲       I can't do this right now.
▲       No, but thank for asking.
▲       Please accept that I cannot come.
▲       I'd rather not.
To say no you should:
▲       Start the sentence with the word no.
▲       Shake your head when you say no to make sure they understand. Your voice should be clear and direct. Keep eye contact.
    If someone makes a request, it is necessary to ask for time to think it over. The decision should be up to you, but sometimes it is difficult to say no. You can try to reply in the following way:
   “Sorry. I would have taken care of your cat next weekend, but I will be going out. I know it will be hard to find someone to take care of the cat. I will try to help you next time.” Remember that: you have the right to say no!

观察下面一组算式，再列出综合算式．

4.2÷5=0.84

0.84＋5.6=6.44

10－6.44=3.56

3.56×50=178

综合算式：____

    One of the main decisions you must make when traveling is deciding where to stay. A place to stay can often make or break a holiday. Whether you are looking for a classy hotel or a night under the stars, we can guide you through your different options.

    Bed and Breakfast

    An English invention, bed and breakfasts, offers exactly what they suggest, a bed for the night and breakfast in the morning. “B&Bs”，are usually someone's private home, often found in the countryside.

    Hostels

    For those traveling on a tight budget, hostels are the best accommodation option. Informal places usually with a lovely relaxed atmosphere, they offer dormitory beds for rent. Bathrooms are usually down the hall.

    Remember to check reviews by previous guests online before you book your hostel.

    Couch Surfing

    An unusual but interesting option, couch(沙发) surfing is a growing trend among young internationals. The idea is that you become a member of the online couch-surfing community (www. couchsurfing. com) and then when you travel, look up other members in that country and ask to stay on their couch. Most hosts will suggest sightseeing trips and take you out in the evening, making it a great way to see things that aren't in your guidebook. And remember, it may be free but don't forget to offer to buy your host a drink or dinner.

    Camping

    Sleeping under the stars! For budget travelers staying at camping grounds is the cheapest way to travel. The drawback is having to carry a tent with you. Camping grounds can be found across Europe, America and Australia. However, if you intend on camping in busy cities check first where the nearest place for camping is. More often than not, they are on the edge of cities, which can mean lengthy bus rides into town when you want to eat or see the sights.

对图示中二战后第二阶段美国经济发展的特点描述最准确的是（    ）