未成年人开始犯错误的高峰年龄是（　　） A．10—12岁 B．12—15岁 C．15

登革热病毒感染蚊子后，可在蚊子唾液腺中大量繁殖。蚊子在叮咬人时将病毒传染给人，可引起病人发热、出血甚至休克。科学家拟用以下方法控制病毒的传播。

(1)将S基因转入蚊子体内，使蚊子的唾液腺细胞大量表达S蛋白，该蛋白可以抑制登革热病毒的复制。为了获得转基因蚊子，需要将携带S基因的载体导入蚊子的_________细胞。如果转基因成功，在转基因蚊子体内可检测出__________、___________和__________。

(2)科学家获得一种显性突变蚊子(AABB)，A、B基因位于非同源染色体上，只有A基因或B基因的胚胎致死。若纯合的雄蚊(AABB)与野生型雌蚊(aabb)交配，F₁群体中A基因频率是___________，F₂群体中A基因频率是____________。

(3)将S基因分别插入到A、B基因的紧邻位置(如图)，将该纯合的转基因雄蚊释放到野生型群体中，群体中蚊子体内病毒的平均数目会逐代__________，原因是___________。

下列对设备磨损的叙述中，不正确的是( )。

A．设备购人未使用情况下不会发生磨损

B．设备在使用过程中，在外力的作用下发生的磨损，称为第一种有形磨损

C．第二种无形磨损是由于科学技术的进步，使原有设备经济效益相对降低而发生贬值

D．设备的综合磨损是指同时存在有形磨损和无形磨损的损坏和贬值的综合情况

Alice is a hard-working student. But _______, she didn't  pass the Chinese exam.           [ ]

A. in fact                  

B. to our surprise          

C. by the way              

D. as a result

We can make mistakes at any age. Some mistakes we make are about money. But most mistakes are about people. “Did Jerry really care when I broke up with Helen?” “When I got that great job, did Jim really feel good about it, as a friend? Or did he envy my luck?” “And Paul-why didn’t pick up that he was friendly just because I had a car?” When we look back, doubts like these can make us feel bad. But when we look back， It’s too late.

Why do we go wrong about our friends – or our enemies? Sometimes what people say hides their real meaning. And if we don’t really listen we miss the feeling behind the words. Suppose someone tells you， “You’re a lucky dog .” that’s being friendly. But “lucky dog”? There’s a bit of envy in those words. Maybe he doesn’t see it himself. But bringing in the “dog” bit puts you down a little. What he may be saying is that he doesn’t think you deserve your luck.

“Just think of all the things you have to be thankful for ” is another noise that says one thing and means another. It could mean that the speaker is trying to get you to see your problem as part of your life as a whole. But is he? Wrapped up in this phrase is the thought that your problem isn’t important. It’s telling you to think of all the starving people in the world when you haven’t got a date for Saturday night.

How can you tell the real meaning behind someone’s words? One way is to take a good look at the person talking. Do his words fit the way he looks? Does what he says agree with the tone of voice? His posture? The look in his eyes? Stop and think. The minute you spend thinking about the real meaning of what people say to you may save another mistake.

小题1:This passage is mainly about           .

A．how to interpret what people say

B．what to do when you listen to others talking

C．how to avoid mistakes when you communicate with people

D．Why we go wrong with people sometimes小题2:According to the author，the reason why we go wrong about our friends is that          .

A．We fail to listen carefully when they talk

B．People tend to be annoyed when we check what they say

C．People usually state one thing but means another

D．We tend to doubt what our friends say小题3:In the sentence “Maybe he doesn’t see it himself” in the second paragraph，the pronoun “it “refers to          .  

A．being friendly

B．a bit of envy

C．lucky dog

D．your luck小题4:When we listen to a person talking, the most important thing for us to do is       .

A．notice the way the person is talking

B．take a good look at the person talking

C．mind his tone，his posture and the look in his eyes

D．examine the real meaning of what he says based on his manner, his tone and his posture小题5:The author most probably is a          .

A．teacher

B．philosopher

C．psychologist

D．doctor

收集卷烟零售户基本信息主要有哪些途径？