单项选择题

A．It helps improve their safety.
B．It allows them to swim faster.
C．It helps them fight their predators.
D．It allows them to avoid twists and turns.
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单项选择题
A．A city guide.B．A librarian.C．A computer expert.D．A registrar.
A．A city guide.
B．A librarian.
C．A computer expert.
D．A registrar.
单项选择题
A．Write the letter.B．Paint the shelf.C．Fix the shelf.D．Look for the pen.
A．Write the letter.
B．Paint the shelf.
C．Fix the shelf.
D．Look for the pen.
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