单选题 By "some people" I mean me. Why is it that an evening stroll leaves me feeling eaten alive while my companions are left blissfully un-bitten? Studies suggest that about 20 percent of people are "high attractor types" who are especially appealing to the female mosquitoes seeking out blood for the extra protein they need to lay eggs. Of course, not all mosquitoes are the same. But let's consider some of the more general properties that affect your mosquito appeal. Clothing Color It's true, mosquitoes have discerning fashion taste. Or at least, they're more likely to spot you as a target if you stand out from your environment. Dark colors, especially, will attract more of the insect. Body Heat Visual clues allow the mosquito to locate you from relatively far away, but as she approaches, it's your body heat that draws her in. This puts pregnant women, who average about 1.26 degrees Fahrenheit warmer than others, at a particular risk—a tact which has been substantiated by a number of studies. Carbon Dioxide This is another reason pregnant women are at a disadvantage. Mosquitoes can detect carbon dioxide using a special organ called a maxillary palp from as far as 164 feet away. Since everyone emits CO ₂ simply by exhaling, it comes down to relative amounts. Unfortunately for mothers-to-be, pregnancy causes women to emit 21 percent more CO ₂ . This is also why kids are often safe from bites, when bigger, more CO ₂ -emitting adults are around. Alcohol Intake On the flip side, pregnant women are(presumably)avoiding another mosquito attractor: alcohol. Although it' s unclear how mosquitoes go about detecting the presence of ethanol, studies show that drinking even just 12 ounces of beer will significantly increase the attention you receive from the pests. The Properties of Your Skin and Sweat Up to 85 percent of your susceptibility to mosquito bites has nothing to do with what you' re drinking, wearing or how much heat your body emits,—it's just genetic. Specifically, the composition of your skin bacteria—the kind that naturally and healthily exists there—can serve as an attractor. Blood Type Another factor you can't control? Your blood type. And it stands to reason that, if the mosquito is there to suck your blood, she cares what kind she's getting. People with blood type O are more prone to mosquito bites than those with type B, with type A folks bringing up the rear.

单选题 According to the author, which factor below serves as the most influencing one in mosquito appealing?

【正确答案】 C

【答案解析】解析：细节题。文中在讲“The Properties of Your Skin and Sweat”时提到“Up to 85 percent of your susceptibility to mosquito bites has nothing to do with what you’re drinking，wearing or how much heat your body emits，一it’s just genetic”，即85％对于蚊子的敏感性和你喝了什么、穿了什么或者你身体散发了多少热量无关，而和基因有关，而基因体现在人体皮肤和汗液的成分上，故选C。

单选题 What is false about the "clothing color" and "body heat" factors?

单选题 What is NOT the reason why the pregnant women have a high risk of mosquito appeal?

【正确答案】 C

【答案解析】解析：细节题。作者在很多小标题下都说到了孕妇的问题，“pregnant women，who average about 1．26 degrees Fahrenheit warmer than others，at a particular risk”，“pregnancy causes women to emit 21 percent more CO ₂ ”，“pregnant women are(presumably)avoiding another mosquito attractor：alcohol”，前两个可以对应A、B、D项，而C项说反了，文中说，孕妇不能喝酒，这个因素上避免了吸引蚊子。

单选题 What is the best title for this passage?

单选题 Which statement is not true according to the author?

【正确答案】 A

【答案解析】解析：细节题。由皮肤和汗的成分影响对蚊子的吸引可以看出，洗澡会影响皮肤的环境，从而影响对蚊子的吸引，故B项正确。从“this is also why kids are often safe from bites，when bigger，more CO ₂ -emitting adults are around”，可见C项正确。从文章开头的表述看出作者比其他人更容易被蚊子咬，故D项正确。根据文章最后一段可知，O型血的人更容易吸引蚊子，A项错误，故选A。