题目

下列说法正确的是A.天然放射现象的发现，揭示了原子核是由质子和中子组成的B.卢瑟福的α粒子散射实验揭示了原子核有复杂结构C.玻尔的原子结构理论是在卢瑟福核式结构学说基础上引进了量子理论D.α射线、β射线、γ射线本质上都是电磁波，且γ射线的波长最短 答案：C     天然放射现象的发现，揭示了原子核是可分的，A项错。卢瑟福的α粒子散射实验揭示了原子的核式结构，B项错。玻尔的原子结构理论是在核式结构基础上引进了量子理论，C项正确。α射线是高速氦核流，β射线是高速电子流，只有γ射线是电磁波，D项错。【2011·山东师大附中第七次质量检测】 完形填空（共20小题；每小题1分，满分20分） 阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并从答题卡上将该选项涂黑。 “It’s no use,Mum,”said Johnny.“I’m just no good at dancing.” “You’ve got to keep trying.Tonight will be   36   ,dear.Try a turn with that pretty Lisette.” Johnny   37   .Every Saturday night used to be the best of the week.He and his parents went to the   38   at the Club,where his hero,Alcide,played the accordion(手风琴)with the band.But lately everything had changed.Now that Johnny was older,he was   39   to dance with a girl!     40    Johnny and his parents arrived at the Club,music had already started.Johnny got up his    41  to approach Lisette.“May I have this dance?”Johnny asked.“That’s all right,”said Lisette.Johnny struggled to keep up with Lisette’s   42   steps,but he was always one beat behind her.Then Johnny heard his friend Pierre say,“Look!Johnny has two left feet!”   43   burst from the crowd.Johnny   44   and ran outside,determined never to go to another dance. The next Saturday,Alcide   45   to Johnny’s house for some potatoes.He happened to hear Johnny playing the accordion.Alcide’s eyes   46   .“Bring that accordion and play some songs tonight,”Alcide said.Then he drove off,leaving Johnny staring openmouthed   47   him. At the Club,Johnny scanned the crowd for Lisette and   48   her.The band played for a long time before Alcide said,“Dear friends,I got a   49   for you tonight.Young Johnny is going to join us!”    50    ,Johnny stepped up on the platform,his eyes on the floor.He began to play,and the band     51     behind him.When the song ended,he heard cheers.Johnny kept playing until the dance was        52   .“You did a fine job tonight.Play with us again next Saturday night,”Alcide said.“Yes,sir!”said Johnny.     53      he went outside,Johnny saw Lisette and her friends near the door.Lisette stepped    54   ,smiling.“You played really good tonight!”she said. “Thank you,”Johnny blushed(脸红).As he walked on,Pierre   55   moved out of the way for him to pass. Johnny patted his accordion.Come to think of it,in his whole life,he had never once seen Alcide out on the dance floor. 36.A.difficult            B.troublesome              C.different            D.terrible 37.A.answered          B.sighed                    C.smiled             D.laughed 38.A.platform           B.appointment               C.meeting            D.dance 39.A.expected           B.invited                   C.allowed            D.chosen 40.A.If                 B.Since                    C.Though            D.When 41.A.spirits             B.feelings                  C.courage             D.strength 42.A.smooth            B.clumsy                   C.slow               D.small 43.A.Shouts             B.Laughter                 C.Applause            D.Cheers 44.A.broke away         B.went out                 C.broke up             D.turned out 45.A.ran                B.walked                  C.drove                D.cycled 46.A.opened             B.rolled                   C.sharpened             D.widened 47.A.off                B.with                    C.after                  D.for 48.A.caught             B.searched                 C.sought                D.spotted 49.A.surprise            B.puzzle                  C.story                  D.joke 50.A.Struggling          B.Trembling               C.Wandering             D.Whispering 51.A.got round           B.joined in                C.turned around           D.showed off 52.A.in                 B.out                     C.over                  D.on 53.A.As                B.Because                 C.Until                  D.So 54.A.backward          B.forward                  C.onward                D.downward 55.A.still               B.even                    C.ever                   D.almost