单项选择题

A．The Rhythmic Cycle of the Sun and the Tide
B．Discoveries in Biology
C．A Scientific Study
D．A Living Clock
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单项选择题
Unemployment rate is high for high school graduates ________.
A．when the economic situation is bad
B．even when economy takes a turn for the better
C．because most of them are from poor families
D．because the service industry is the most fragile sector of economy
单项选择题
A．From Land Animal to King of the SeaB．The Food of the WhaleC．The Whale’’s Ancient AncestorD．How Whales Catch Food
A．From Land Animal to King of the Sea
B．The Food of the Whale
C．The Whale’’s Ancient Ancestor
D．How Whales Catch Food
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