问题 问答题 简答题

简述公畜繁殖障碍的主要表现。

答案

参考答案:

(1)遗传性繁殖疾病:主要包括隐睾、睾丸发育不全、染色体畸变。

(2)免疫性繁殖障碍:主要为精子易发生凝集反应。

(3)机能性繁殖障碍:主要包括性欲缺乏(阳萎)和交配困难。

(4)精液品质不良:主要表现为射精量少,无精子、死精子、精子畸形和活力不强等。此外,精液中带有脓汁、血液和尿液等,也是精液品质不良的表现。

(5)生殖器官疾病:主要包括睾丸炎及附睾炎(阴囊积水)、外生殖道炎症(阴囊炎、阴囊积水、前列腺炎、精囊腺炎、 * * 球腺炎和包皮炎等)。

单项选择题

Standard English is the variety of English which is usually used in print and which is normally taught in schools and to non-native speakers learning the language. It is also the variety which is normally (1) by educated people and used in news broadcasts and other (2) situations. The difference between standard and nonstandard, it should be noted, has (3) in principle to do with differences between formal and colloquial (4) ; standard English has colloquial as well as formal variants.

(5) , the standard variety of English is based on the London (6) of English that developed after the Norman Conquest resulted in the removal of the Court from Winchester to London. This dialect became the one (7) by the educated, and it was developed and promoted (8) a model, or norm, for wider and wider segments of society. It was also the (9) that was carried overseas, but not one unaffected by such export. Today, (10) English is arranged to the extent that tile grammar and vocabulary of English are (11) the same everywhere in the world where English is used; (12) among local standards is really quite minor, (13) the Singapore, South Africa, and Irish varieties are really very (14) different from one another so far as grammar and vocabulary are (15) .Indeed, Standard English is so powerful that it exerts a tremendous (16) on all local varieties, to the extent that many of long-established dialects of England have (17) much of their vigor and there is considerable pressure on them to be (18) . This latter situation is not unique (19) English: it is also true in other countries where processes of standardization are (20) .But it sometimes creates problems for speakers who try to strike some kind of compromise between local norms and national, even supranational ones.

10()

A.formal

B.colloquial

C.non-standard

D.standard

单项选择题