问题 选择题

在一个装片盒里,有一张细菌和一张酵母菌永久装片的标签脱落了,你可以依据什么把它们区分开来,重新贴上标签呢(   )

A.细胞质的有无

B.细胞壁的有无

C.遗传物质的有无

D.是否有真正的细胞核

答案

答案:D

题目分析:细菌与真菌的根本区别在于真菌具有成形细胞核,细菌没有成形的细胞核,只有DNA集中的区域。酵母菌是真菌,因此在显微镜下会看到细胞内有成形的细胞核,而细菌内没有成形的细胞核。

故D符合题意。

问答题 简答题
单项选择题

Many foreigners who have not visited Britain call all the inhabitants English, for they are used to thinking of the British Isles as England. (1) , the British Isles contain a variety of peoples, and only the people of England call themselves English. The others (2) to themselves as Welsh, Scottish, or Irish, (3) the case may be; they are often slightly annoyed (4) being classified as "English".

Even in England there are many (5) in regional character and speech. The chief (6) is between southern England and northern England. South of a (7) going from Bristol to London, people speak the type of English usually learnt by foreign students, (8) there are local variations.

Further north regional speech is usually " (9) " than that of southern Britain. Northerners are (10) to claim that they work harder than Southerners, and are more (11) They are open-hearted and hospitable; foreigners often find that they make friends with them (12) Northerners generally have hearty (13) : the visitor to Lancashire or Yorkshire, for instance, may look forward to receiving generous (14) at meal times.

In accent and character the people of the Midlands (15) a gradual change from the southern to the northern type of Englishman.

In Scotland the sound (16) by the letter "R" is generally a p sound, and "R" is often pronounced in words in which it would be (17) in southern English. The Scots are said to be a serious, cautious, thrifty people, (18) inventive and somewhat mystical. All the Celtic peoples of Britain (the Welsh, the Irish, the Scots) are frequently (19) as being more "fiery" than the English. They are (20) a race that is quite distinct from the English. (289 words)

Notes: fiery 暴躁的,易怒的。

(8)()

A.who

B.when

C.though

D.for