麻烦帮我做一道英语完形填空题,限时的..Good morning,students.Today we will continue our investigation of the mosquito(蚊子).We all thought that mosquitoes follow skin odors(气味),but no such odor has been identified.It turns out,in

麻烦帮我做一道英语完形填空题,限时的..Good morning,students.Today we will continue our investigation of the mosquito(蚊子).We all thought that mosquitoes follow skin odors(气味),but no such odor has been identified.It turns out,in
麻烦帮我做一道英语完形填空题,限时的..
Good morning,students.Today we will continue our investigation of the mosquito(蚊子).We all thought that mosquitoes follow skin odors(气味),but no such odor has been identified.It turns out,in fact,that no skin seems to be as attractive to a mosquito as a current of air(气流) having the right degree of warmth and humidity(湿度).But,a mosquito can be turned off its course by a repellent(驱蚊剂).This is how it works:a mosquito senses humidity in a airstream by means of tiny pores(气孔) in the hairs located on its antennae(触角).These hairs send electrical impulses to the central nervous system whenever they encounter humidity in the air.The repellent blocks the pores through which mosquitoes sense the presence of water vapor(水汽) in the air.As a mosquito comes in for a landing on a warm moist body,the repellent blocks the mosquito's sensors,and realizing that it has lost its moist current of air,it instinctively changes its course.
1.What is the main topic of this talk?
A:Independence of skin odors.
B:Interaction between mosquitoes and repellents.
C:The mosquito's central nervous system.
D:Components of air currents.
2.According to the speaker,what are mosquitoes attracted to ____?
A:Skin odors
B:Water vapor
C:Warmth and moisture
D:Air currents
3.What does the mosquito repellent do?
A:It blocks the hairs in the sensors.
B:It changes the humidity of the skin.
C:It blocks the pores in the hairs.
D:It changes the moisture in the air.
4.What happens when the mosquito comes into contact with the repellent?
A:It quickly moves off in another direction.
B:The pores in the hairs on its skin become blocked.
C:It sends an electrical impulse to its central nervous system.
D:Its sensors become blocked by the water vapor in the repellent.
5.According to the passage,what can be inferred about mosquito repellents?
A:They appear to be highly effective.
B:A degree of instability in their use has emerged.
C:More research is needed into their efficiency.
D:Their reliability has yet to be proved.

麻烦帮我做一道英语完形填空题,限时的..Good morning,students.Today we will continue our investigation of the mosquito(蚊子).We all thought that mosquitoes follow skin odors(气味),but no such odor has been identified.It turns out,in
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