问题 探究题

在生物学探究过程中,很多需观察的生物材料必须制成玻片标本,然后放在显微镜下观察:

(1)制作番茄果肉细胞装片时,先在玻片上滴一滴清水。为什么制作人的口腔上皮细胞装片时,却先在玻片上滴一滴生理盐水呢?                    __。    

(2)用于制作玻片标本的生物材料,必须处理得          ,有时为了观察得更清楚,还需对玻片标本进行            处理。    

(3)下图是在显微镜下观察到的番茄果肉细胞,要将图1转换为图2,需采用A~G中的哪几个步骤?请将需要的步骤选出来。          

A.转动粗准焦螺旋B.转动细准焦螺旋C.将光圈调大D.将光圈调小E.向右上方移动玻片F.向左下方移动玻片G.转动转换器

答案

(1)因为口腔上皮细胞无细胞壁,滴生理盐水,可以防止细胞吸水涨破

(2)薄而透明    染色

(3)E、G、D、B

完形填空

第二节:语法填空(共10小题;每小题1. 5分,满分15分)

阅读下面短文,按照句子结构的语法性和上下文连贯的要求,在空格处填入一个适当的词或使用括号中词语的正确形式填空,并将答案填写在答卷标号为3l—40的相应位置上。

The most sought-after tickets of the opening and closing ceremonies of the Guangzhou 2010 Asian Games, are priced as high as 6,800 yuan, exceeding that of the Beijing Olympic Games, announced the GAGOC(Guangzhou Asian Games Organizing Committee) on Wednesday afternoon. “The prices are fixed,   31   (basis) on the pricing of previous games and the buying power of the locals,” said Ms Yuan Yue, Deputy Director of the Marketing Department of the GAGOC.

The ticket price of the Beijing Olympics, of which the highest is 5,000 yuan, is   32   exception, claimed Ms Yuan. “The highest price of the Athens Olympics, for example, is roughly 10,000 yuan, so we think 6,800 yuan is a   33   (reason) price. Another factor we   34   (consider) a lot is the buying power of the locals. The PRD(Pearl River Delta) is one of the richest regions of China and there is a huge demand   35   the tickets of the Guangzhou Asian Games.”

Nevertheless, about 87% of the games’ tickets   36   (sell) from10 to 400 yuan,  37  will make the tickets affordable to ordinary citizens. The average ticket price will be 200 yuan.

Organizers have divided tickets sales into three stages and the first will start in January 2010. GAGOC may adjust the launch time of   38   stage subject to the competition schedule. Tickets can be purchased   39   the Official Ticketing Website of the 16th Asian Games, at ticket outlets   40   at venue-based ticket booths during the Games. GAGOC will reserve some tickets for school students and youth athletes through an educational initiative to further the development of the Olympic Movement among youngsters.

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