单项选择题

A．To help mariners.
B．To improve ship design and sailing methods.
C．To study astronomy and mathematics.
D．To improve his own skill as a sailor.
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单项选择题
A．Purchase her plane ticket.B．Change her plane ticket.C．Pick up a passport application form.D．Arrange for her accommodations in Europe.
A．Purchase her plane ticket.
B．Change her plane ticket.
C．Pick up a passport application form.
D．Arrange for her accommodations in Europe.
单项选择题
A．A box.B．A young tree.C．A book.D．Apples.
A．A box.
B．A young tree.
C．A book.
D．Apples.
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