Five respondents opted to receive their questionnaires by email while another five had the questionnaires sent to them by express mail.
五受访者选择通过电子邮件收到他们的调查问卷，而另外五个有快件发送给他们的问卷。
Along with those, written questionnaires and samples, either handed out in stores or sent by mail, are effective tests to see if consumers like a product or not.
与书面问卷调查相比，商店通过邮件发送进行有效的测试，看看消费者喜欢何种产品。
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