单项选择题

According to the passage, the holiday-makers on the beach were______.

A．confined within a roped-off area
B．confined to the upper part of the wreck
C．kept well away from the orange markers
D．discouraged form entering the roped-off area

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单项选择题

We are told that work on the wreck was made difficult by______.

A．the slope of the beach
B．the height of the ship
C．the number of holiday-makers
D．the volume of the sand

单项选择题

Fibers of hair and wool are not continuous and must normally be spun into thread ______ woven into textile fabrics.

A．as are they
B．when to be
C．that they are
D．if they are to be