题目

某化学兴趣小组的同学在探究金属的有关性质时，进行了如图所示实验:在A实验结束后将两支试管内的物质倒入一洁净烧杯中,一段时间后过滤 。为确定过滤后得到的滤渣和滤液的成分,同学们进行了如下实验。实验一:滤渣的成分是什么?（1）甲同学取少量滤渣于试管中,加入稀硫酸,无气泡产生，证明滤渣里不含_________，乙同学通过物理方法也得到同样的结论，请简述其方法和现象:_________。实验二:滤液里的溶质有哪些?（2）同学们一致认为定有FeSO4,为确请认真阅读下面短文，从短文后各题所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。 It was in my high school science class. I was doing a task in front of the classroom with my favorite shirt on.     A   41   came, “Nice shirt,” I smiled from ear to ear. Then another voice said, “That shirt belonged to my dad. Greg’s mother works for my family. We were going to   42   that shirt away, but gave it to her   43  .” I was speechless. I wanted to hide.     I   44   the shirt in the back of the closet and told my mum what had happened. She then dialed her   45  , “I will no longer work for your family,” she told him. That night, Mom told my dad that she couldn’t clean anymore; she knew her life’s   46   was something greater.     The next morning she   47   with the personnel manager at the Board of Education. He told her that without a proper education she could not teach. So Mom decided to   48   a university.     After the first year in college, she went back to the personnel manager. He said, “You are   49  , aren’t you? I think I have a   50   for you as a teacher’s assistant. This opportunity deals with children who are mentally challenged with little or no chance of   51  .” Mom accepted the opportunity very   52  .     For almost five years, as a teacher’s assistant, she saw teacher after teacher give up on the children and quit, feeling   53  . Then one day, the personnel manager and the principal   54   in her classroom. The principal said, “We have watched how you   55   the children and how they communicate with you and admire your hard-working   56   over the last five years. We are all in agreement that you   57   be the teacher of this class.”     My mom spent more than 20 years there.   58   her career, she was voted Teacher of the Year. All of this came about because of the   59   comment made in the classroom that day. Mom showed me how to handle   60   situations and never give up. 1.A. noise                     B. voice                       C. sound                       D. tune 2.A. get                     B. take                      C. carry                        D. throw 3.A. otherwise                     B. anyhow                    C. instead                            D. actually 4.A. settled                   B. pushed                     C. stored                      D. stuck 5.A. teacher                B. employer                  C. director                 D. adviser 6.A. purpose                 B. encouragement     C. achievement                     D. victory 7.A. went                         B. met                  C. worked                    D. stayed 8.A. visit                      B. continue                   C. attend                      D. prepare 9.A. serious                  B. fortunate                  C. careful                      D. responsible 10.A. career                  B. duty                         C. position                 D. part 11.A. learning               B. judging                   C. obeying                    D. imagining 12.A. patiently                     B. eagerly                     C. successfully              D. skillfully 13.A. upset                   B. frightened                C. guilty                       D. ashamed 14.A. looked up            B went up                     C. took up                  D. showed up 15.A. believe             B. protect                      C. treat                         D. receive 16.A. spirit                   B. intention                  C. action                      D. attempt 17.A. must              B. would                      C. might                       D. should 18.A. At                     B. During                     C. On                         D. With 19.A. worthless        B. thoughtless         C. hopeless                   D. helpless 20.A. challenging          B. different                   C. dangerous                 D. strange