单项选择题

Which of the following is not true according to the passage

A．The Chinese sailors knew the winds and currents of the Pacific much earlier than the westerners.
B．The Chinese sailors used the compass to guide their voyage.
C．The Chinese sailors knew how to make rocking ship's surface level
D．The compass the Chinese mariners used had magnetized needles.
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单项选择题
Why did Cheng Ho go on his first voyage in 1405
A．He wanted to be the first to sail round the world.
B．He had to collect gifts and tributes for his emperor.
C．He was ordered to hunt the deposed former emperor.
D．He wanted to include the places he would cover into the Chinese territory.
单项选择题
It is implied but not stated that ancient navigation used to sail ______ .
A．with their knowledge of the winds
B．by the sky
C．by the compass
D．by the currents of the Pacific
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