Due to lapse of time the risk in these areas to surface navigation is now considered （）than the ordinary risks of navigation，but a very real risk still exists with regard to anchoring，fishing or any form of submarine or seabed activity.<br>A:more serious<br>B:not less serious<br>C:more dangerous<br>D:no more dangerous

Due to lapse of time the risk in these areas to surface navigation is now considered （）than the ordinary risks of navigation，but a very real risk still exists with regard to anchoring，fishing or any form of submarine or seabed activity.
A:more serious
B:not less serious
C:more dangerous
D:no more dangerous

出自：海船船员证

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