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【单选题】
在GMDSS系统中,A3海区是指()。A.
Inmarsat卫星所覆盖的区域
B.
Inmarsat卫星所覆盖的海域，但不包括A1、A2海区
C.
具有DSC功能的HF无线电岸台所覆盖的海域
D.
A4海区以外的区域
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反馈参考答案：
举一反三
【单选题】听力原文：W: One of her grades was 90, and another was 50. M: Her work is very uneven. What was the girl's low grade?
A.
140.
B.
50.
C.
90.
【单选题】听力原文：W: One of her grades was 90, and another was 50. M: Her work is very uneven. What was the girl's low grade?
A.
9.
B.
50.
C.
90.
【单选题】A:Are you satisfied with her work, sir? B:Not at all、It couldn't be any _______.
A.
better
B.
best
C.
worse
D.
worst
【单选题】She ________ on her work so much that she didn’t notice that a crowd of people had _______around her.
A.
focused; focused
B.
fixed; gathered
C.
concentrated; concentrated
D.
carried; collected
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