题目

某物质在空气里燃烧的生成物是二氧化碳、二氧化硫和水，这种物质的成分里（ ）A.只含有碳元素、硫元素和氢元素B.一定含有碳元素、硫元素和氢元素，还可能含有氧元素C.氢元素与氧元素的原子个数比为2∶1D.硫元素与氧元素的原子个数比为1∶2 答案：解析：根据产物只能确定该物质中一定含C、S、H元素，无法确定是否含O。答案：B阅读理解。     When a storm is coming, most people leave the area as quickly ad possible and head for safety. But there are a few people who will get into their cars and go straight for the center of the storm. These peopleare willing to risk (冒…危险) being killed by floods or 100-kilometer-an-hour winds for the excitement ofwatching the storm close up.      "Storm chasing (追逐) " is becoming an increasingly popular hobby (喜好), especially in the Midwestof the United States, where there are frequent storms between March and July. A storm chaser begins theday by checking the Internet for the latest weather reports, and then drives up to 1,000 kilometers to wherethe storm will be and wits for it to develop.      Although anyone can do it, storm chasing is extremely dangerous. The power of a big storm can throwa cow into the air or destroy a whole house in seconds. Storm chasers are also often hurt in accidents caused by driving in a heavy rain. If you are a beginner, it is much safer to join a group for storm-chasing vacationsduring the storm season.      Even then, storm chasing is not all adventure and excitement. "Storm chasing is 95% driving," says DanielLynch, who spends most of his summer storm-chasing. "Sometimes you can sit around for hours waiting forsomething to happen, and all you get is blue sky and a few light showers."     However, for storm chasers, it is all worth it. "When you get close to a storm, it is the most exciting sightyou will ever see in your life," says Jasper Morley."Every storm is an example of the power of nature, It is the greatest show on Earth." 1. For storm chasing, the first thing storm chasers do is to _____. A. head straight for the center of the storm B. get into the car for safety C. wait patiently for the storm to develop D. collect information about a coming storm 2. Beginners of storm chasing are advised _____. A. not to drive in a heavy rain B. to do it in an organized way C. not to get too close to a storm D. to spend more time on it in summer 3. By saying "it is all worth it" in the last paragraph, the author means that _____. A. storm chasing costs a lot of money B. storm chasing is worth hours of waiting C. efforts in storm chasing are well paid D. a storm presents the greatest show on Earth 4. What can we learn from the text? A. Sometimes storm chasers get nothing but disappointment B. Many storm chasers get killed in the storms. C. Storm chasing is becoming popular around the world/ D. Storm chasing is only fit for young people.