The safety of ships at sea does not
depend only on the arrangements made in the ships themselves. Dangerous coasts
and rocks may be seen in the daytime, (51) they are a threat
to safe navigation at night. Lighthouses are therefore erected at such places
to (52) sailors of the danger. Modern lighthouses are put up
at all dangerous places near the courses (53) by ships. On
some rocky coasts several lighthouses may be built not far from each other,
and (54) the sailors on a ship may know which is which, they
have (55) arrangements of lights. One lighthouse will
give a single flash at regular (56) , another may give two
flashes; a third may give two followed by one; and so on. (57)
watching the lights the navigator is able to decide exactly where he
is, and he can set his (58) with confidence. In A. however B. and C. but D. or
更多"The safety of ships at sea does not"的相关试题:
[单项选择]
The safety of ships at sea does not
depend only on the arrangements made in the ships themselves. Dangerous coasts
and rocks may be seen in the daytime, (51) they are a threat
to safe navigation at night. Lighthouses are therefore erected at such places
to (52) sailors of the danger. Modern lighthouses are put up
at all dangerous places near the courses (53) by ships. On
some rocky coasts several lighthouses may be built not far from each other,
and (54) the sailors on a ship may know which is which, they
have (55) arrangements of lights. One lighthouse will
give a single flash at regular (56) , another may give two
flashes; a third may give two followed by one; and so on. (57)
watching the lights the navigator is able to decide exactly where he
is, and he can set his (58) with confidence. In A. warn B. predict C. announce D. show
[单项选择]How much percent does the sea cover the earth A. 69 B. 70 C. 71 D. 79
[填空题]
What does a sea horse do when it wants to stay in one place
It takes hold of plants with__________.
[单项选择]How many ships are there in the sea A. Yes, it is. B. Sorry, I don’t know. C. I don’t think so.
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