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．The crop’’s blooming period is delayed.B．The roots of crops are cut off.C．The topsoil is seriously damaged.D．The growth of weeds is accelerated.
A．The crop’’s blooming period is delayed.
B．The roots of crops are cut off.
C．The topsoil is seriously damaged.
D．The growth of weeds is accelerated.
单项选择题
A．The presidents of the United States.B．Congress of the USA.C．The relationship between the Republican Party and the Democratic Party.D．The Republican Party.
A．The presidents of the United States.
B．Congress of the USA.
C．The relationship between the Republican Party and the Democratic Party.
D．The Republican Party.
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