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【单选题】
根据抗原抗体反应的特点,以下说法正确的是
A.
抗原抗体结合牢固不易受环境影响
B.
解离后的抗体结构活性改变
C.
解离后抗体不能再与抗原结合
D.
抗体与抗原结合后仍可与其他抗原结合
E.
解离后抗体的活性和特异性不变
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举一反三
【单选题】With our country entering an aging society, ______ the retirement age is probably unavoidable.
A.
having delayed
B.
delaying
C.
being delayed
D.
to be delayed
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【简答题】在C++中，若需要在程序文件中进行标准输入输出操作，则必须在开始处加入预处理命令include＜iostream.h＞，若使用到数学库中的函数时，要在源程序的开始处加入预处理命令【 】。
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【多选题】关于接线盒明装和暗装,说法正确的是
A.
接线盒镶嵌在墙里的是暗装
B.
接线盒外挂在墙面的是明装
C.
新建楼房接线盒一般是暗装
D.
新建楼房接线盒一般是明装
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【单选题】____several times，but unfortunately，the boy still couldn’t smooth away the problem on his own.
A.
Having been explained
B.
The problem having been explained
C.
The problem had been explained
D.
Although the problem had been explained
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【单选题】Anna was reading a piece of science fiction, completely ______ to the outside world.
A.
having been lost
B.
to be lost
C.
losing
D.
lost
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【单选题】(Having eaten) the cherry pie, I (struck) several pits and (nearly) (broke) a tooth.
A.
Having eaten
B.
struck
C.
nearly
D.
broke
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【单选题】A few days after the interview, I received a letter _____ me admission to the university. [     ]
A.
having offered
B.
offered
C.
to be offered
D.
offering
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【单选题】At last she left her house and got to the airport, only ______the plane flying away.
A.
having seen
B.
to have seen
C.
to see
D.
saw
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【单选题】. _______from the operation, the patient was advised to stay in hospital for another two weeks.
A.
Having not fully recovered
B.
Being not fully recovered
C.
Not having fully recovered
D.
Not fully recovering
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【单选题】Academic publishers try to yield higher profits by the following means EXCEPT______.
A.
having students buy new editions
B.
publishing a textbook series
C.
discouraging the use of used textbooks
D.
bullying small new publishers of textbooks
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相关题目：
【单选题】With our country entering an aging society, ______ the retirement age is probably unavoidable.
A.
having delayed
B.
delaying
C.
being delayed
D.
to be delayed
查看完整题目与答案
【简答题】在C++中，若需要在程序文件中进行标准输入输出操作，则必须在开始处加入预处理命令include＜iostream.h＞，若使用到数学库中的函数时，要在源程序的开始处加入预处理命令【 】。
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【多选题】关于接线盒明装和暗装,说法正确的是
A.
接线盒镶嵌在墙里的是暗装
B.
接线盒外挂在墙面的是明装
C.
新建楼房接线盒一般是暗装
D.
新建楼房接线盒一般是明装
查看完整题目与答案
【单选题】____several times，but unfortunately，the boy still couldn’t smooth away the problem on his own.
A.
Having been explained
B.
The problem having been explained
C.
The problem had been explained
D.
Although the problem had been explained
查看完整题目与答案
【单选题】Anna was reading a piece of science fiction, completely ______ to the outside world.
A.
having been lost
B.
to be lost
C.
losing
D.
lost
查看完整题目与答案
【单选题】(Having eaten) the cherry pie, I (struck) several pits and (nearly) (broke) a tooth.
A.
Having eaten
B.
struck
C.
nearly
D.
broke
查看完整题目与答案
【单选题】A few days after the interview, I received a letter _____ me admission to the university. [     ]
A.
having offered
B.
offered
C.
to be offered
D.
offering
查看完整题目与答案
【单选题】At last she left her house and got to the airport, only ______the plane flying away.
A.
having seen
B.
to have seen
C.
to see
D.
saw
查看完整题目与答案
【单选题】. _______from the operation, the patient was advised to stay in hospital for another two weeks.
A.
Having not fully recovered
B.
Being not fully recovered
C.
Not having fully recovered
D.
Not fully recovering
查看完整题目与答案
【单选题】Academic publishers try to yield higher profits by the following means EXCEPT______.
A.
having students buy new editions
B.
publishing a textbook series
C.
discouraging the use of used textbooks
D.
bullying small new publishers of textbooks
查看完整题目与答案