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【单选题】
关于细菌外毒素描述错误的是A.
多数由革兰阳性菌产生
B.
可脱毒形成类毒素
C.
无抗原性
D.
毒性强
E.
对组织有选择性毒性作用
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举一反三
【单选题】I often visited the British Museum ______ I was staying in London.
A.
until
B.
while
C.
during
D.
throughout
【简答题】I see the German bombers and fighters in the sky, still smarting from many a British whipping.
【简答题】Listen and draw a line.
【单选题】In radio and television ______ impossible to draw the line between news and entertainment programs.
A.
frequently is
B.
are frequently
C.
it is frequently
D.
where they are frequently
【简答题】First draw a line the middle of the page. Then write a word in the space above the line. A. across 13. over C. between D. within
【单选题】氢氯噻嗪的利尿作用机制是
A.
抑制Na + —k + —2Cl - 同向转运系统
B.
对抗醛固酮K + —Na + 交换过程
C.
抑制Na + —Cl - 同向转运系统
D.
抑制磷酸二酯酶,使cAMP增多
E.
抑制肾小管碳酸酐酶
【单选题】I find the British legal system extremely ______ and it's really difficult to understand it.
A.
impartial
B.
irrational
C.
complicated
D.
sophisticated
【单选题】I lunch when I learned that former British prime minister Margaret Thatcher had passed away.
A.
ate
B.
had eaten
C.
was eating
D.
were eating
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