单环芳烃不溶于（）。 A.汽油 B.水 C.四氯化碳 D.乙醚

什么是主发电机的理想外特性？

Can you believe your eyes? A recent experiment suggests that the answer to that question may depend on your age.

Martin Doherty, a psychologist at the University of Stirling in Scotland, led the team of scientists. In this experiment, Doherty and his team tested the perception(观察力) of some people, using pictures of some orange circles. The researchers showed the same pictures to two groups of people. The first group included 151 children aged 4 to 10, and the second group included 24 adults aged 18 to 25.

The first group of pictures showed two circles alone on a white background. One of the circles was larger than the other, and these people were asked to identify the larger one. Four-year-olds identified the correct circle 79 percent of the time. Adults identified the correct circle 95 percent of the time.

Next, both groups were shown a picture where the orange circles, again of different sizes, were surrounded by gray circles. Here’s where the trick lies in. In some of the pictures, the smaller orange circle was surrounded by even smaller gray circles — making the orange circle appear larger than the other orange circle, which was the real larger one. And the larger orange circle was surrounded by even bigger gray circles — so it appeared to be smaller than the real smaller orange circle.

When young children aged 4 to 6 looked at these tricky pictures, they weren’t fooled — they were still able to find the bigger circle with roughly the same accuracy as before. Older children and adults, on the other hand, did not do as well. Older children often identified the smaller circle as the larger one, and adults got it wrong most of the time.

As children get older, Doherty said, their brains may develop the ability to identify visual context. In other words, they will begin to process the whole picture at once: the tricky gray circles, as well as the orange circle in the middle. As a result, they’re more likely to fall for this kind of visual trick.

小题1:Doherty and his team of scientists did an experiment to evaluate        .

A．children’s and adults’ eye-sight

B．people’s ability to see accurately

C．children’s and adults’ brains

D．the influence of people’s age小题2:When asked to find the larger circle,        .

A．children at 6 got it wrong 79 % of the time with no gray ones around

B．only adults over 18 got it right 95% of the time with gray ones around

C．children at 4 got it right about 79 % of the time with gray ones around

D．adults got it right most of the time with gray ones around小题3:According to the passage, we can know that        .

A．a smaller orange circle appears bigger on a white background

B．an orange circle appears bigger than a gray one of the same size

C．a circle surrounded by other circles looks bigger than its real size

D．a circle surrounded by bigger ones looks smaller than its real size小题4:Visual context may work when children get older than        .

A．4

B．6

C．10

D．18小题5:Why are younger children not fooled?

A．Because they are smarter than older children and adults.

B．Because older people are influenced by their experience.

C．Because people’s eyes become weaker as they grow older.

D．Because their brain can hardly notice related things together.

试述焦炉预砌的目的？

中国晓辉公司与日本大合公司于 2001年5月签订了购买3500吨钢材的合同，由中国远洋公司的“东风”号将该批货物从日本神户运至宁波，“海神”号在途中遇小雨，因货舱盖不严使部分货物生锈。下列关于货物责任的选项哪个是正确的

A．大合公司应自行承担此项损失

B．晓辉公司应赔偿大合公司的损失

C．承运人可依海商法的规定主张免责，但应承担举证责任

D．承运人应赔偿货物锈损的损失

已知y^*=e^xsinx+excosx+e^2x是二阶常系数线性微分方程y"+ay’+by=ce^2x的一个特解，试确定常数a，b，c的值，并求此方程的通解．