单项选择题

A．The reproductive cycle of barnacles.
B．A new source of protein.
C．Types of sea animals.
D．The adhesive quality of barnacles.
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单项选择题
A．Apple pies.B．Chocolate cakes.C．Ice cream.D．Nothing:
A．Apple pies.
B．Chocolate cakes.
C．Ice cream.
D．Nothing:
单项选择题
Tile word challenged in Para. 3 most probably means ______.
A．"fought against"
B．"criticized"
C．"doubted or suspected"
D．"disapproved"
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