Have you ever heard the high, steady whine of a mosquito during a quiet evening? Remember your uneasiness when that noise suddenly stopped? You knew the mosquito might have flown off or landed somewhere on the wall. But you

also knew he might be ready to bite. More accurately, she might be ready, for only the (A)_____ mosquito bites. When she targets an animal or a human, she thrusts a "sawing tube" (a tube with an outside surface of tiny teeth or projections) into the skin. Then she forces fluid into the blood to keep it from clotting as it meets the air. Finally, with a strong sucking movement, (B)she drinks her fill. Then she flies away, leaving an annoying bite that itches for hours or even days.