1 . What Is Your Pet Trying to Tell You
Animals want our attention, and sometimes they’re quite obviously about asking for it. Unusual behaviors are often our pets’ way of telling us to stop what we’re doing and play with them. It’s why Fido constantly chases his tail and why Kitty keeps rolling around. A desperately bored pet may have “bad” behaviors to get a reaction-even a negative one!
Feed me.
Sure, your dog loves you, but that’s not why he’s licking(舔)your face. A puppy learns to lick his mother’s mouth to get a little leftover food, so Spot isn’t kissing you in our sense of the word; he just wants a snack.
I’m stressed.
Cat owners also misinterpret their furry friends’ kisses. While a cat might lick you to show love, sometimes she’ll do it to ease herself. One way to tell if her licking is stress-related is to see if it goes on for an extended period of time. Birds also overclean when they feel anxious. Some will even drag out their own feathers.
My tail tells all.
Dogs wag(摇)their tails to the right when they see something or someone they want to approach, and to the left when they see something they want to avoid. When frightened, dogs curl their tails in, while cats wrap theirs around themselves. And if a cat’s tail looks like a question mark, she’s eager to play.
1. What does a dog show if it kisses its owner?| A．Hunger. | B．Love. | C．Fear. | D．Sadness. |
| A．Two. | B．Three. | C．Four. | D．Five. |
| A．They will drag others’ feathers. |
| B．They will approach someone they like. |
| C．They will clean their feathers more than necessary. |
| D．They will stare at their owners for a longer time. |
2 . If you’re worried about your receding hairline (后退的发际线) and you live in a city, you might want to consider moving, as scientists have found exposure to high levels of air pollution may be linked to retention.
New research presented at the European Academy of Dermatology and Venereology (EADV) Congress in Madrid found particulate matter (PM) (颗粒物), which is present in polluted air, could impact both hair growth and retention.
The team took cells from the base of hair follicles (毛囊) and then exposed them to the polluted air. They used various concentrations of PM10, and 24 hours later, they tested the samples to detect whether specific hair-growth proteins in the cells had changed at all.
Researchers found that the presence of PM10 decreased levels of the protein responsible for hair growth — beta-catenin — and morphogenesis, the biological process that causes an organism to develop its shape. According to the study, the levels of three other proteins which are responsible for hair growth and hair retention — cyclin D1, cyclin E and CDK2 — were also decreased.
This meant that the greater the level of pollutant, the greater the decrease in proteins was found.
This is one of the first studies to look at the link between pollution and baldness (秃头).
Hyuk Chul Kwon from the Future Science Research Centre in South Korea said: “While the link between air pollution and serious diseases, such as cancer, are well established, there is little to no research on the effect of particulate matter exposure on the human skin, and hair in particular. And our research explains the mode (模式) of action of air pollutants on human hair follicle cells, showing how the most common air pollutants lead to hair loss.”
1. What does the underlined word “retention” in Para 1 refer to?| A．Hair cells. | B．Hair loss. |
| C．Hair growth. | D．Hair-growth proteins. |
| A．Air pollution can increase levels of hair-growth proteins. |
| B．There’s only one protein that is responsible for hair growth. |
| C．Polluted air has no direct impact on hair growth or retention. |
| D．The more serious air pollution, the more likely you’re to lose your hair. |
| A．Meaningful. | B．Negative. |
| C．Unimportant. | D．Objective. |
| A．The solutions to air pollution. |
| B．The growth mechanism of hair. |
| C．The impact of air pollution on health. |
| D．The close link between air pollution and hair loss. |
