问题 解答题

右图为某种细胞的结构示意图,请据图回答

(1)图中C结构是______,其中有许多可被碱性染料染成深色的物质______,

此物质由______和______组成,______上有遗传信息.细菌细胞与它相比最重要的区别是没有C结构,因此细菌属于______生物.

(2)这是______细胞,之所以这样判断是因为它有______,______,______.

(3)人体细胞与此细胞的共同结构是______,______,______.

答案

(1)细胞核中有容易被碱性染料染成深色的物质,叫染色体.染色体由DNA和蛋白质组成,细菌细胞无成形的细胞核,所以是原核生物.(2)(3)植物细胞的结构有细胞壁、细胞膜、细胞质、细胞核、液泡、叶绿体,动物细胞无细胞壁,液泡、叶绿体.细菌细胞无成形的细胞核,真菌细胞无叶绿体,因此此图是植物细胞结构图.

故答案为:

(1)细胞核、染色体、DNA、蛋白质、DNA、原核

(2)植物、细胞壁、叶绿体、大液泡

(3)细胞膜、细胞质、细胞核

阅读理解

“Can I see my baby?” the happy new mother asked. When the bundle was in her arms and she moved the fold of cloth to look upon his tiny face, she gasped. The doctor turned quickly and looked out of the tall hospital window. The baby had been born without ears.

Time proved that the baby’ s hearing was perfect. It was only his appearance that was imperfect. When he rushed home from school one day and threw himself into his mother’s arms, she sighed(叹息), knowing that his life was to be misfortunate. He cried to his mum “A boy, a big boy... called me a freak (怪人).”

He grew up, handsome. A favorite with his fellow students, he might have been class president, but for that. He developed a gift, a talent for literature and music. “But you might communicate with other young people,” his mother blamed him, but felt a kindness in her heart.

Two years went by. One day, his father said to the son, “You’ re going to the hospital, son. Mother and I have someone who will donate the ears you need. But it’ s a secret.” The operation was a great success, and a new person appeared.

Later he married and became a lawyer. One day, he asked his father, “Who gave me the ears? Who gave me so much? I could never do enough for him or her.” “I do not believe you could,” said the father, “but the agreement was that you are not to know... not yet.”

The years kept their secret, but the day did come. He stood with his father over his mother’ s casket棺材. Slowly, tenderly, the father stretched forth a hand and raised the thick, reddish brown hair to show the mother had no outer ears.

“Mother said she was glad she never let her hair be cut,” his father whispered gently, “and nobody ever thought Mother less beautiful, did they?”

小题1:Why did Mother gasp when she saw her newborn baby?

A.Because her son had a tiny face.

B.Because she saw her son crying.

C.Because her son was born imperfect.

D.Because her son was in her arms.小题2:Which word can describe Mother’ s feeling when the son threw himself into her arms?

A.Nervous.      

B.Sympathetic.

C.Proud.

D.Angry.小题3:We can infer that the person who donate the ears is_____.

A.A doctor.

B.His father.

C.His mother.

D.A stranger.小题4:From the passage we know the followings are True except________

A, the mother felt sorry for the son without ears   B. the doctor didn’t like the baby

C. the boy meant everything to the mother        D. the father kept the secret until mother died

小题5:The best title for the passage would be ________.

A.Mother’s hair

B.An unforgettable memory

C.Who gave me the ears?

D.Who is my best respectable person?

单项选择题

“阳历”与“阴历”这两个词虽然大家都熟悉,但是仍有不少人对其理解有误。有人认为阳历来自外国,这是不对的。我们从甲骨文中可以看出我国三千年前就有十三月的名称,已经是阴阳历并用。《书经•尧典》上说“期三百有六旬有六日以闰月定四时成岁”。三百有六旬有六日就是阳历年;以闰月定四时成岁乃是阴阳历并用。西洋在希腊罗马时代也夹用阴阳两历,和我国原是一样的。阴历是完全依据月亮的[a],阳历则完全依据太阳的[b]。月亮绕地球一周所需时间为29.53059天,就是29天12小时44分3秒。地球绕太阳一周所需时间为365.242216天,即365天5小时48分46秒。两个小数不能相互除尽,要把它们合起来非常困难。但我国在春秋时代已知道十九年七闰的方法,把阴阳二历调和得相当成功。
二十四节气也是我国古代历法的特点。节气是完全跟太阳走的,可称阳历的一部分。地球绕日因为昼夜长短太阳高低的不同,所以一年有春夏秋冬四季。二十四节气中,十二个为气,十二个为节。节应在月初,气应在月中,譬如立春为阴历正月之节,雨水乃正月之气等等。二十四节气是一个循环,有天,一节一气平均 30天多一点。而阴历一个月只有29天有余。过了若干时候必会有月份单有节而无气,或单有气而无节。这有节无气的月份就叫做[ ]。这样安排的好处是阴阳两历的周期都照顾到了,维持了一个月中晦朔弦望,和一年中的春夏秋冬。它的缺点是年度长短不同,平年只有354天,闰年多一个月就有384天,计算极不方便。

第二段讲二十四节气时,指出节气“可称阳历的一部分”,这样说是( )。

A.因为他有一部分节气是根据阴历推算确定的

B.因为二十四节气恰好分布在十二个月之内

C.因为没有二十四节气也就没有阳历了

D.因为二十四节气是观察太阳运行来确定的