题目

下图有机物的正确命名为 ( ) A．2-乙基-3,3-二甲基戊烷                             B．3,3-二甲基-4-乙基戊烷 C．3,3,4-三甲基己烷                                      D．3,4,4-三甲基己烷 答案：C 【解析】 烷烃命名时，要选最长的碳链为主链，据此得出是“某烷”，然后从离支链近的一端给主链上的碳原子进行编号，当两端离支链一样近时，要从支链多的一端开始编号，将取代基写在“某烷”的前面，据此分析。 【详解】 烷烃命名时，要选最长的碳链为主链，此烷烃的主链有6个碳原子，故   When people talk about air pollution,they are usually thinking about outdoor air 1         But do you know that there is also air pollution inside homes,offices,hotels and other buildings? The air in your home can be 2 to 100 times more polluted than the air outdoors!In fact,some American doctors say that 50% of illnesses have 2       to do with polluted indoor air.    A lot of pollution comes from indoor activities 3       smoking and cooking. As most people 4       about 80% - 90% of their time inside buildings,it is important to take indoor air pollution seriously,too.   Air pollution influences our health 5       When the air is polluted,not only young children and old people 6       from it,7        people with healthproblems suffer as well. Indoor air pollution can 8       people’s eyes,noses and throats. Air pollution,both indoor and outdoor,can also 9       to lung cancer and heart disease!In the great London fog in 1952,4,000 people died in a few days 10       the pollution!It is said that half a million young children and women die each year  inIndiabecause of indoor  air pollution!(   ) 1. A. pollution     B. polluteC. polluting     D. polluted(   ) 2. A. nothing     B. everythingC. something     D. anything(   ) 3. A. as well as     B. such asC. instead of     D. so as(   ) 4. A. take     B. cost  C. spend     D. give(   ) 5. A. in many ways     B. in many thingsC. in many houses D. in many years (   ) 6. A. worry     B. bearC. stand     D. suffer(   ) 7. A. and     B. but  C. or     D. while(   ) 8. A. hit     B. hurtC. pollute     D. beat(   ) 9. A. cause     B. getC. give     D. lead(   ) 10. A. because of     B. thanks toC. related to     D. because