资料：之后，经济学家Mr.X展望了中欧之间的商业机遇，请根据下列资料回答问题。 Finding a trustworthy supplier This is perhaps the most important step in your import business. A serious and dependable supplier minimizes any concerns on quality, trust and disputes. There are a number of sourcing sites where you can find suppliers from massive directories. To find the right one can be a laborious task, but your work can be made easier by going to sites that screen suppliers before they are listed-like Global Sources Online. Under their “verified suppliers” system, suppliers need to have their company information and contact person verified and are visited 3 times in-person before being authenticated as a “verified supplier”. This also means if you pick a export-ready. Once you’re in contact with prospective supliers, address all your quality concerns with the right questions. State your requirements to suppliers clearly-like product warranty, key specifications and order terms. Alternatively, some suppliers will provide product samples if you ask, so you can first test them yourself. lf you’re happy with the quality of this sample shipment, you can order in bulk. lf possible, try and attend a sourcing fair to test samples free of charge. Most sourcing fairs are organized around themes like “Clothing & Garments” or “Electronics”, so buyers like you can meet all the specialized sellers of the produts you want. Factory visits and inspections China’s business environment is changing rapidly, and you’d be surprised how much factories can develop in a year. If this is too much trouble for you, consider appointing a local agent or third-party quality （3PQ） firm to inspect the factory on your behalf. Get someone who speaks the language and knows local business conditions enough to make a good judgment. Most agents usually charge by commission from the amount of goods you import, and also inspect the output before it gets shipped. Why should businessmen make use of the sites that screen suppliers?（ ）