题目

小金对课本中“影响酶催化作用的因素”实验进行了拓展探究，实验过程如下： 编号 试管1 试管2 试管3 1%淀粉溶液 2mL 2mL 2mL 蒸馏水 1mL / / 盐酸 / 1mL / NaOH溶液 / / 1mL 加入新鲜唾液淀粉酶溶液 1mL 1mL 1mL 37℃水浴 10min 10min 10min 体积分数0.4%的碘酒溶液 2滴 2滴 2滴 实验现象 不变蓝 变蓝 不变蓝 （1） 小金 阅读理解 　　If you go to a fast food restaurant, you will probably see a lot of teenagers．Today, many teenagers are overweight, and this is because of their bad eating habits．Most teenagers are keen about food with a lot of fat, oil, salt and sugar．People call this kind of food "junk food"． 　　But bad eating habits go beyond fast food．We find many teenagers eat unhealthily．Some don't have breakfast before they go to school．During the day, some don't have a proper meal for lunch．In a recent survey at one school, scientists found that over two thirds of the students didn't follow a healthy diet．They didn't like vegetables, and many of them didn't like to eat fruits．They preferred to eat food with a lot of salt, sugar, or fat． 　　Parents today also worry about their children's diet．Some doctors give the following advice： 　　Teenagers shouldn't eat too much junk food． 　　Teenagers shouldn't eat food with too much salt．Salt can cause high blood pressure in the future． 　　Teenagers should eat food without much fat, oil and sugar． 　　Teenagers need to eat some fruits and vegetables every day．Fruits and vegetables are rich in vitamins(维生素)and have little fat． 　　Teenagers need to drink more milk．Milk will help their bones grow。 　　Teenagers need　to eat breakfast every day．It is good for their body and mind． (1) How many pieces of advice are given by the doctors in the passage? [　　] A． Five B． Eight C． Six D． Seven (2) The underlined phrase "are keen about" in the passage means ________． [　　] A． dislike B． love C． hate D． refuse (3) Which of the following is WRONG? [　　] A． Today all teenagers are overweight． B． Scientists found two thirds of the students didn't have a healthy diet． C． Parents are worried about their children's diet today． D． Milk, fruits and vegetables are good for children． (4) It's right to ________ according to the passage． [　　] A． eat junk food B． eat food with too much salt C． drink milk and eat junk food often D． eat vegetables that are rich in vitamins (5) The main purpose of the passage is to tell the children ________． [　　] A． how to keep a healthy diet B． to eat fruits and vegetables C． how to have a proper meal for lunch D． not to eat junk food