氯与氨反应生成氯胺所产生的余氯叫（）。

4个5相乘是（    ），再加上18是（    ）。

还原2.4×10^-3mol〔XO（OH）〕²⁺到X元素的低价态时，需消耗30mL0.2mol•L^-1的亚硫酸钠（Na₂SO₃）溶液，则在此反应中X元素的低价态为（　　）

A．0价

B．+1价

C．-1价

D．-2价

（）用来解释相似资源储备国家之间和同类工业品之间的双向贸易现象。

A.赫克歇尔—俄林理论

B.规模经济贸易理论

C.比较优势理论

D.绝对优势理论

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。

（12）（）

A.swiftly

B.promptly

C.immediately

D.quickly

下面说法正确的是（）

A.大光圈能够进入的光线多，所以快门相应的要慢

B.光圈也控制了镜头的焦距

C.小光圈能够拍摄更远的物体（景深大）

D.辅助光是塑造拍摄主体的主要光线，置于拍摄物顶部有较好效果