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【单选题】
You are at anchor in fog. The fog signal of a vessel underway has been steadily growing danger and the danger of collision appears to exist. In addition to your fog signal, what signal may be used to indicate the presence of your vessel?A.
Three blasts on the whistle; one prolonged, one short, and one prolonged.
B.
Three blasts on the whistle; one short, one prolonged, and one short.
C.
Three blasts on the whistle; one prolonged followed by two short.
D.
No signal other than your fog signal may be used.
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【单选题】听力原文：M: Oh my God, it's already 8:40! W: There's no rush. I can take you in the car. M: Won't it make you late? W: No, I'm going right past your place. What does the woman suggest the man doing?
A.
Rush to work.
B.
Go with her together.
C.
Drive her car.
D.
Hurry up.
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【简答题】一个生态系统中,一般有 生产者 、 、 和 等组成。
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