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【单选题】
关于保持正规的瞭望,下列说法哪个正确?A.
只要能发现碰撞危险,就意味着保持的瞭望是正规的
B.
保持正规的瞭望,就意味着在任何时候,每一船舶应采取适合当时环境和情况下一切有效的手段保持系统的观察
C.
只要船舶使用视觉进行不间断的观察,即可认为保持着正规的瞭望
D.
保持正规的瞭望,就意味着在任何时候,每一船舶可使用段进行不间断的观察
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举一反三
【单选题】It is not who rules us ______ is important, but how he rules us.
A.
what
B.
that
C.
/
D.
which
【简答题】Who will do more harm to the environment, the developing countries or the developed countries?
【单选题】听力原文：The new rules call for blood centres to develop more ways to make sure the country's blood supply. According to the speaker,
A.
there are more ways to ensure blood supply.
B.
more ways should be developed.
C.
new rules should be developed.
D.
more blood supply should be called for.
【单选题】From 1949 to 1972, the number of scientists who moved into the USA from various countries in the world reached ()
A.
200 000
B.
300 000
C.
400 000
D.
500 000
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