题目

下列叙述正确的是（ ）A.化合反应中各元素存在形态一定发生变化B.赤铁矿是一种常见的铁合金C.利用活性炭的吸附性可进行硬水软化D.能使无色酚酞溶液变红的溶液一定不是酸溶液 答案：【答案】D【解析】A、化合反应中各元素存在形态不一定发生变化，如氧化钙与水反应生成氢氧化钙，反应前后各元素均为化合态，选项错误；B、铁合金中的铁元素以游离态存在，而赤铁矿的主要成分是氧化铁，其中的铁元素以化合态存在，所以赤铁矿不是铁合金，选项错误；C、活性炭具有吸附性，只 Bayfield Shopping Coupons (赠券) 1. Six Hours Free Parking     If you spend $ 100 or more in our stores you will receive six hours of free parking. When you have spent $100 or more, just take this coupon and your receipt to the customer service desk on level 4. They will stamp your parking ticket to allow 6 hours of free parking. Offer here until November 14. 2. Win a $1000 CD Collection     Win your choice of $1000 worth of CDs from JB Music Store. Just buy any two CDs and your name will go into the competition. Select your own prize from our wide variety of rock, pop, jazz and classical music.     Competition ends November 14. Prize drawn on November 21. Check store for more information 3. Buy One, Get One Free     Buy one shirt or tie at Daniel’s Menswear, and get another shirt or tie of the same value free.     Choose from any of our dress shirts and we will give you another one at no cost.     Hurry! Offer ends November 14.     Offer limited to one per customer. 4. 10% Off     Present this coupon at The Book Store to get a 10% discount on any books you buy. We have lots of books to choose from, including children’s books, novels, travel guides, and science works. You are sure to find something that you will enjoy. Shop now for Christmas, we have a large quantity of toys as gifts for you and avoid the rush! Offer here until November 14 5. Half-price Movie Tickets     Buy any full-price movie ticket on Tuesdays or Wednesdays, and you can buy a second tickets for a friend for only half price. The latest movies are here, being shown in one of our five theaters at Bayfield Shopping Center. Offer here through December 1, Limit on per customer. 6. Free Soft Drink     Buy any meal for at least $6 at Mike’s Café, and receive a free soft drink. We serve the best food in the Shopping Center. Come in and try our delicious meals and our excellent service. You won’t be disappointed! Free soft drink offer ends November 14. 1.What are these ads for?   A. Food you can order for delivery.       B. Places to go on vacation.   C. Special offers at a shopping center.   D. Things on sale in a big store. 2.Which of the following is true according to the ads?   A. Spending $50 means 3 hours of free parking.   B. One person can buy 5 tickets for the price of three.   C. After buying two CDs, you can get another two CDs for free.   D. At Mike’s Café, people can get a free drink after spending $6. 3.Which of the following is NOT mentioned at this mall?     A. Clothes store.       B. Music store.    C. Restaurant.      D. Toy store. 4.We can know from this passage ________.     A. there is more than on theater in the center.     B. if you buy a book there, you may pay less than half the price.     C. you may get a free on if you buy a shirt, or a tie, or a pair of shoes.     D. you won’t get a free soft drink unless you spend more than 10 dollars on the meal.