Our scientific findings cannot be regarded as ______. in such a short period of time.
A. to have been obtained
B. to be obtained
C. having been obtained
D. being obtained
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APC片的正常外观是
A. 黄绿色片，味微酸
B. 红色带荧光片
C. 橙黄色片
D. 白色片，味微酸
E. 绿色，味咸
I'm very glad to know that my boss has generously agreed to ______ my debt in return for certain services.
A. take away
B. cat out
C. write off
D. clear up
国际铁路联运列车所载货物如需变更国内到站或出境站的，应由( )负责通知海关。
A. 办理变更手续的车站
B. 承载货物的列车车长
C. 变更后的国内到站或出境地
D. 工进出口货物的收发货人
The author says Johnson found it very difficult to walk because ______.
A. he could not control his legs
B. he has some psychological barrier
C. people always stared at him
D. it hurt his friends to watch him
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