[单项选择]

Passage Three
Sea horses have unusual parents. The female sea horses lay the eggs, but unlike other creatures. It’s the males that give birth to the young.
Male sea horses have a fold of skin on their bellies that forms a pocket, called a brood pouch. During the breeding season, the sea horse’s pouch swells to receive eggs. A female sea horse lays up to 200 eggs at a time in the pouch. Then she swims off, leaving her male partner to care for the developing eggs and give birth to young sea horses. The female will return every day to check on her mate and the eggs, but she doesn’t stay long,nor does she take part in the birth.
It takes from five to six weeks for the eggs in the male’s pouch to develop. During this time the male avoids open water and hides in sea grass. His big pouch makes it difficult from him to swim, so the male often uses his tall to grasp a piece of sea grass. Firmly, gripping the grass, he will stay perfec
A. It is dangerous for fenmle.
B. It happens once a year.
C. It is hard work for the male.
D. It occurs in the deep sea.

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