计算机系统的弗林分类法是按什么来分类的？共分哪几类？解释其含义。

任务型读写（共10小题，每小题1分，满分10分）
请认真阅读下列短文，并根据所读内容在文章后表格里填入最恰当的单词。注意：每空只填一个单词。
Have you ever started sneezing when eating peanuts, getting rash on your skin or feeling your heat starting to beat faster? Statistics show that around 12 million Americans suffer from food allergy, with 6.9 million allergic to seafood and 3.3 million allergic to peanuts or tree nuts.
Food allergic symptoms occur immediately after having an allergen food. The food is treated as harmful to the body, by the immune system, which defends our organism from harmful external attacks. Here are a few guidelines about things you should know and how to put them into practice to prevent food allergies and eat healthily.
When buying food, read attentively the labels on the food products. All manufacturers according to the new Food Allergen and Consumer Act must clearly list all the elements of the product including the 8 food allergens even if they are present in very small amounts. Don’t buy these products, even if they might be cheaper.
Parents should be very careful when preparing food. The table and cooking tools used need to be clean. It is recommended to cook the food of the allergic person in the first place.
Food allergic persons should have a little patience. In certain people, the allergy disappears gradually. Visit your doctor at regular times to find about the progress of your allergies instead of having strict diets every day.
Keep a diary to note the foods that worsen your food allergies, new experiences and changes that you notice. Being tempted to have a piece of cake can be very dangerous. Your health is much more worth than it. Always think about the efforts people around you are putting to create an allergic-free environment for you.
Allergic persons should avoid consuming cakes that are not homemade and should always carry some snacks on them. Buying food in restaurants is risky.

Food Allergy
小题1: ___________	Preventions
小题2: ___________ Getting skin rashFeeling小题3:_________ heartbeat	l     Check food labels cautiously; 小题4: __________ buying allergen foods. l     Prepare food carefully; make 小题5: __________ the table and cooking tools are clean. l     Be 小题6:_________ till the allergy disappears. l     See doctors 小题7: __________. l     Keep a diary of allergen foods and the 小题8:_________ they have on you. l     Resist any temptation to eat 小题9: __________ foods. l     Carry snacks instead of 小题10: __________ foods.