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  3. Some spiders hunt on the ground, others build webs to trap their food, but the grass water spider catches its prey by running al

Some spiders hunt on the ground, others build webs to trap their food, but the grass water spider catches its prey by running al

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问题     Some spiders hunt on the ground, others build webs to trap their food, but the grass water spider catches its prey by running along the surface of the water. This special water spider lives on the grassy banks of streams where mosquitoes, damselflies and other insects come to feed and breed.
    Although it is one of the largest spiders in New Zealand, it has an unusual ability. It doesn’t disturb the water as it waits for its meal, and there is barely a ripple when it skims across the surface at lightning speed to catch its prey. Grass water spiders deal swiftly with larger insects like damselflies by pulling their heads under the water and holding them there until they drown.
    After a meal, the grass water spider spends up to half an hour grooming itself. It wipes its eight eyes, brushes its antennae, and takes special care to clean the hairs on its body. It is the hairs that trap tiny bubbles of air so that the spider can run down a blade of grass and stay underwater for up to an hour when it is frightened. The hairs also keep the spider dry, even underwater.
    It is only when the female spider is caring for the young that she does not hunt on the water. After mating, she produces a large egg sac, which she carries around for five weeks. Once the eggs start to hatch, she attaches the sac to some blades of grass or a thistle. She then tears the sac open and releases the tiny spiders into the nursery web.
How does the grass water spider kill its prey?
选项 A、in a web
B、by drowning
C、by poisoning
D、with its antennae
答案B
解析 细节题。根据文章第二段描述“by pulling their heads under the water and holdingthem there until they drown．”可知：水蜘蛛将它们猎物的头部拖进水里，直到猎物被淹死。故答案为B。
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