单项选择题
某商场失窃。员工甲、乙、丙、丁涉嫌被拘审。
甲说：“是丙作的案。”
乙说：“我和甲、丁三人中至少有一个作案。”
丙说：“我没有作案。”
丁说：“我们四人都没作案。”
如果四人中只有一个说真话，则可推出以下哪项结论？（）
A．甲说真话，作案的是丙。
B．乙说真话，作案的是乙。
C．丙说真话，作案的是甲。
D．丙说真话，作案的是丁。
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单项选择题
听力原文： Mosquitoes do not randomly perch on just anyone's body and begin sucking for the most fragrantly appealing humans. Mosquitoes use odor to sort attractive people from the unattractive to find those that are most tasty. Researchers found one sure way to stop attracting the little bugs--stop breathing. Mosquitoes can sniff out an attractive target from as far as 40 miles. When humans exhale, they expel a plume of CO2 and other odors that travel through the air. The appetizing stir is the equivalent of a dinner bell, alerting mosquitoes that a warm meal is within range. When a mosquito is trailing an attractive target, it zigzags up the breath plume until it makes contact, landing on the skin and patiently searching for just the right spot to insert its stylet for an eight-to-ten second feeding. Perspiration, a barely avoidable human condition, also is a mosquito lure--but only if the sweat has formed , bacteria. Bathing helps reduce the attractiveness of sticky bodies, but after-bath products don't. Skin-care products that clean, soften and moisturize not only improve a person's appearance, they're also attractive to mosquitoes. Certain medications, including heart and blood pressure medicine, also alter a person's likelihood of being bitten. Scientists conducted the research to explore the tastes of mosquitoes and help humans protect themselves from mosquito-borne disease.All of the following are causes of being bitten by mosquitoes EXCEPT ______.A．carbon dioxide and other odorsB．sweatC．the quality of your skinD．heart and blood pressure medicine
A.
B.
C.
D.
E.
F.
All
G.
A．carbon
H.sweat
C．the
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单项选择题
班干部都参加了奥运志愿服务，小赵也参加了奥运志愿服务，所以，小赵是班干部。以下哪项中的推理与上文中的最相似？（）
A．班干部都参加了奥运志愿服务，小刘没有参加奥运志愿服务，所以，小刘不是班干部。
B．高一(2)班排名前10的都考上了大学，小赵考上了大学，所以，小赵在高一(2)班排名在前5。
C．2008年以后购买的电脑都安装了Vista系统，我的电脑安装了Vista系统，所以，我的电脑是2008年以后购买的。
D．学习成绩差的大学生不能参加国庆节广场联欢，小刘参加了国庆节广场联欢，所以，小刘成绩一定不错。 -
单项选择题
卡车只在晚上8点以后才上路行驶。酒后开车的司机都不开车灯。面包车晚上8点以后都不上路行驶。晚上8点以后上路行驶的车都开着车灯。有的军车晚上8点以后上路行驶。如果以上命题都是真的，那么以下哪种情况是不可能出现的？（）
A．面包车司机酒后开车。
B．面包车在行驶中开着车灯。
C．司机酒后开车撞上了卡车。
D．军车司机酒后开车。
