After the final voyage, these expensive expeditions were halted since new military threats came from the north and resources were needed to focus on land defenses there instead.
A. until
B. after
C. as
D. so
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When Zhu Di took the throne in 1402, he made his companion Ma He the director of palace servants…
A. enthronement
B. resigned
C. left office
D. acceded to the throne
The prince whom Ma He served, Zhu Di,was only 11 years older than Ma He. (B)
A. Ma He served the prince Zhu Di, whom
B. Ma He served the prince Zhu Di, who
C. Zhu Di served the prince Ma He, who
D. Zhu Di served the prince Ma He, whom
He also commissioned the construction of a large number of ships, with Zheng He supervising the construction and then commanding the fleet.
A. which Zheng He supervising the construction and then commanding the fleet
B. when Zheng He supervising the construction and then commanding the fleet
C. while Zheng He supervised the construction and then commanded the fleet
D. what Zheng He supervised the construction and then commanded the fleet
(back door)后门——名词。在安全系统中,设计人员或维护人员特意在合适的地方所留下的入口,可能是 。同义术语trap door(活门)。