B

　 We use both words and gestures to express our feelings，but the problem is that these words and gestures can be understood in different ways．It is true that a smile means the same things in any language．So does laughter or crying．

　　 Fear is another emotion that is shown in much the same way all over the world．In Chinese and in English literature．a phrase like“he went pale and began to tremble” suggests that the man is either very afraid or he has just got a very big shock．However，”“he opens his eyes wide” is used to suggest anger in Chinese while in English it means surprise．In Chinese“surprise”can be described in a phrase like“they stretched out their tongues”．But in English it is an insulting

gesture or expresses strong dislike．

　　 Even in the same culture，people differ in ability to understand and express feelings．Experiments in America have shown that women are usually better than men at recognizing fear，anger，love and happiness on people’s faces．Other studies show that older people usually find it easier to recognize or understand body language than younger people do．

38．According to the passage，　　　　　　　　　　 ．

　 　　 A．we can hardly understand what people’s gestures mean

　 　　 B．we can not often be sure what people mean when they describe their feelings

　　 in words or gestures

　 　　 C．words can be better understood by older people

　 　　 D．gestures can be understood by most of the people While words can not

39．In the same culture，　　　　　　　 ．

　 　　 A．people have different ability to understand and express feelings

　 　　 B．people have the same understanding of something

　 　　 C．people never fail to understand each other　　

　 　　 D．people are equally intelligent

40．From this passage，we can conclude　　　　　　　　

　　 A．words are used as frequently as gestures

　　 B．words are often found difficult to understand

　　 C．words and gestures are both used in expressing feelings

　　 D．gestures are more efficiently used than words

41．The best title fur this passage may be 　　　　　　　．

　　 A．Words and Feelings　 B. Words，Gestures and Feelings

　　 C．Gestures and Feelings D．Culture and Understanding

A

　 When friends come to visit us in the evening，they，spend their time telling us they are in a hurry and looking at their watches．It isn’t that our friends are all very busy; it is just that we haven’t got a television．People think that we are very strange．“But what do you do in the evening?”they are always asking． The anser is very simple．Both my wife and I have hobbies．We certainly don’t spend our evenings staring at the walls．My wife enjoys cooking and，painting and

often attends evening classes in foreign languages．This is very useful as we often go abroad for our holidays．I collect stamps and I’m always busy with my collection． Both of us enjoy listening to the music and playing chess together．

　　 Sometimes there are power cuts and we have no electricity in the house．This does not worry us．We just light candles and carry on with what we were doing before．Our friends，however，are lost－no television! So they don’t know what to do．On such evenings our house is very full：they all come to us．They all have a good time．Instead of sitting in silence in front of the television，everybody talks and plays games．

36．The couple have not got a television because　　　　　 ．

A．they are not rich enough

　　　 B．they are strange people

　　　 C．they enjoy spending evenings in their own ways

　　　 D．they don’t know what to do when there are power cuts

37．The best title for this passage is　　　　　 ．

A ．Why Do We Need a Television?　

B．Candle! But No Electricity!

C．Different Friends，Different Hobbies．　　

D．We Go Without Television

7．根据观察“植物细胞的有丝分裂”实验，回答下列问题：

(1)剪取根尖的长度为　　　 mm原因是　　　　　　 。

(2)制作装片的步骤为　　　　　　　　 。

(3)在低倍显微镜下观察，分生区细胞的特点是　　　　　　　 。

(4)现欲将在显微镜视野右下方的分生区细胞移至视野中央，应将装片向　　　　 移动。

6．某学生做“细胞的质壁分离和顼壁分离的复原”实验，所用材料为紫色洋葱鳞茎，试剂是30%的蔗糖溶液，请回答：

(1)在显微镜下观察到洋葱表皮细胞，B图处于　　　　 状态；⑦处溶液叫　　　　 ；⑧处

溶液是　　　　　　 。

(2)B图细胞中原生质层包括标号　　　　 ，依次对应A图细胞中的标号为　　　 。发生质

壁分离的原因是A图细胞外蔗糖溶液的浓度比①处溶液浓度　　　　　　 。

5．下图中A、B、C三图依次表示酶浓度一定时，反应速度和反应物浓度、温度、PH值的关系。请据图回答下列问题：

(1)图A中，反应物达到某一浓度时，反应速度不再上升，其原因是　　　　　　 。

(2)图B中，a点所对应的温度是　　　　　　　 。

(3)图B中，a点到b点曲线急剧下降，其原因是　　　　　　 。

(4)将装有酶与反应物的甲、乙两试管分别放入12°C和75℃水浴锅中，20分钟后取出转入37℃的水浴锅中保温，两试管内反应分别应为

甲　　　　　　　　 ，乙　　　　　　　　　

(5)图C表示了　　　　　　　　　 催化反应的速率变化曲线。

A．唾液淀粉酶　 B．胃蛋白酶 C．胰蛋白酶

4．将小麦栽培在适宜的光照、温度和重组的条件下培养。

(1)经过一段时间后，突然停止光照，发现小麦体内三碳化合物含量突然上升，这是因为光反应停止，不能形成　　　　 所必需的[H]和ATP，而暗反应仍能进行，与　　 结合，形成三碳化合物的结果。

　 (2)如果在上述实验中，在停止光照的同时，使温度下降至某一温度时，小麦体内的暗反应将会停止，其原因是　　　　　　 。

　 (3)如果在上述实验中，在适宜的温度和中等强度光照下不断地增加的浓度，司以看到光合作用的效率会随之升高。但是当的浓度达到一定数值后，光合作用的速率则不再增大，其原因是光反应中产生的　　 的数量是有一定限度的，限制了三碳化合物的还原。此时如果想继续升高光合作用的效率，　 可能有效的措施是　　　　　 。

3．下图表示一个细胞周期中，洋葱根尖细胞有丝分裂时，DNA和染色体含量的变化．请据图回答：

(1)曲线a代表　　　　　　 含量的变化，曲线b代表　　　　　　 含量的变化。

(2)A→B是　　　　　 期；C→D是　　　　 　　　　期。

(3)方锤体出现在　　　　 时期，染色体数目加倍发生在　　　 时期：观察染色体的最佳时期是　　　　 。(用图中序号填空)

2．下图为植物细胞结构模式图，请据图回答：

(1)进行光合作用的细胞器是[　 ]　　　　　　　 。

(2)合成淀粉酶的场所是[　 ]　　　　　　 。　

(3)同遗传和变异密切相关的结构是[　 ]　　　　 ，其主要成分为　　　　　　　 。

(4)具有双层膜的两种细胞器是[　 ]　　　　　　 、[　 ]　　　　 。