But mosquitoes also use their eyes and sense of touch. Michael Dickinson is a professor at the California Institute of Technology. His research shows how these small insects，with even smaller brains，use three senses to find a blood meal.

　　Michael Dickinson’s team used plumes—a material that rises into the air of carbon dioxide gas into a wind tunnel. They then used cameras to record the mosquitoes. The insects followed the plume.

　　Then，the scientists placed dark objects on the lighter  colored floor and walls of the  tunnel. Mr. Dickinson said，at first，the mosquitoes showed no interest in the objects at all.    “What was quite striking and quite surprising is that the mosquitoes fly back and forth for hours. These are hungry females and they completely ignore the objects on the floor and wall of the tunnel. But the moment they get a hit of CO2，they change their behavior quite obviously and now would become attracted to these little visual blobs (斑点）.”

　　This suggested to the researchers that a mosquito’s sense of smell is more important in the search for food. Once mosquitoes catch a smell of a human  or animal，they also follow  visual signals.

　　25.What do mosquitoes mainly use to find their targets?

　　A．Sense of smell. B．Sense of touch. C．Sense of sight. D．Smart brains.

　　26.The first response of the mosquitoes to the objects in the experiment is     .

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