Black holes are part of space. Black holes exist but are difficult to observe.

admin2009-01-21 50

问题 Black holes are part of space.
Black holes exist but are difficult to observe.

选项 A、Right
B、Wrong
C、Not mentioned

答案A

解析

转载请注明原文地址:https://kaotiyun.com/show/tehd777K

职称英语理工类C级

相关试题推荐

随机试题

最新回复(0)