Article: Spam mail is a fact of Internet life. Some of it carries bad things, but the main problem with spam is that it is unpleasant because it fills your mail box with pointless messages. Most email programs have built-in filters that will discover unwanted messages and put them into a junk folder . You can make the filter learn what you consider to be spam or block certain senders. Avoid letting your email address appear on websites--spammers search the Internet for email addresses. Be careful who you give your email address to, and if you need to send out several copies of an email, use blind copy instead to cover the other people's addresses. Delete spam emails without opening them. Signs of possible spam are bad spelling in email headers, strange sender addresses, or emails sent at unusual hours. If you do open a spam mail, never reply to it or click on any pictures it may have. If you receive an unexpected email pretending to come from your bank, credit card company or other suppliers, be very careful. If the email asks you to reply, don't do it! Instead, call up these places or visit their websites. Consider setting up a second email address and keep one address for your personal use and another for your online communication. Question: What is the main problem with spam? Yes or no, is the answer "It's unpleasant."?
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Article: The human body is a living machine, and, like all machines, it needs "fuel" to supply it with energy. This is provided by the food we eat. But how much do we need to stay healthy? The energy value of food is usually measured in calories . A calorie is the amount of heat required to raise the temperature of 1 kg of water by 1degC. The number of calories people need per day is different, as the picture shows. Also, the number of calories you use at any one moment normally depends on the activity you are in. For example, you need more calories for standing than for sitting, more for running than for walking, and so on. The energy in food is in the form of three kinds of chemical materials--carbohydrate , protein and fat. Carbohydrate provides 3.8 Cal /gm of the energy, protein 4.0 Cal/gm, and fat 8.8 Cal/gm. Each food contains different amounts of these materials, as the round pictures show. (P= protein C= carbohydrate F=fat) Question: How many calories are needed to raise the temperature of 5kg of water from 35degC to 90degC? Yes or no, is the answer "275."?
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Article: Last year I travelled to Paris by plane. I was very excited because I knew I would meet a lot of interesting people and see some amazing things there. On the night before I left, I was so excited that I couldn't sleep at all. When I sat on the plane the next day, I felt very tired. I wanted to have a good sleep during the 9-hour flight. Unluckily, there was a baby sitting next to me. It cried and screamed during the whole trip. How could I fall asleep with all of that noise? When I arrived in Paris at last, it was already 8 o'clock in the evening. I felt even more tired. After getting off the plane, I went to my hotel at once. I paid no attention to the beautiful evening scenery of Paris. I just wanted to have a good rest in my room. When I lay down on the comfortable bed, I fell asleep very quickly. A sudden noise woke me up at midnight. I didn't know what happened, so I turned on the light. What did I see? You wouldn't believe it! I saw two mice playing on the floor! What a terrible trip! Question: When did the writer probably start his trip? Yes or no, is the answer "At about 11 a.m."?
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