單項(xiàng)選擇題The flood stream here is at an average rate of 0.8().

A.cables
B.miles
C.kilometers
D.knot


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1.單項(xiàng)選擇題The fog is lifted, so()the radar.

A.close
B.open
C.switch off
D.switch on

2.單項(xiàng)選擇題The fog is lifted, so()the radar.

A.close up
B.switch on
C.open
D.switch off

3.單項(xiàng)選擇題The fog is too thick. Don’t()the radar.

A.switch on
B.switch off
C.close
D.open

4.單項(xiàng)選擇題The lighthouse if()at night may be in trouble.

A.invisible
B.it is invisible
C.isn't visible
D.unvisible

5.單項(xiàng)選擇題The Loran needs().

A.repairing
B.to repair
C.repairs
D.have repaired