B．The author was annoyed by the air while riding.

　　C．The author was praised by the other bikers.

　　D．The author took great pleasure in biking.

　　C

　　Low­Cost Gifts for Mother's Day

　　Gift No. 1

　　Offer to be your mother's health friend. Promise to be there for any and all doctor's visits whether a disease or a regular medical check­up. Most mothers always say "no need"， but another set of eyes and ears is always a good idea at a doctor's visit. The best part? This one is free.

　　Gift No. 2

　　Help your mother organize all of her medical records, which include the test results and medical information. Put them all in one place. Be sure to make a list of all of her medicines and what times she takes them. "Having all this information in one place could end up saving your mother's life，" Dr. Marie Savard said.

　　Gift No. 3

　　Enough sleep is connected to general health conditions. "Buy your mother cotton sheets and comfortable pillows to encourage better sleep，" Savard said. "We know that good sleep is very important to our health."

　　Gift No. 4

　　Some gift companies such as Presents for Purpose allow you to pay it forward this Mother's Day by picking gifts in which 10 percent of the price you pay goes to a charity (慈善机构). Gift givers can choose from a wide variety of useful but inexpensive things-many of which are "green"-and then choose a meaningful charity from a list. When your mother gets the gift, she will be told that she has helped the chosen charity.

9. What are you advised to do for your mother at doctor's visits?

　　A. Take notes. B. Be with her.

　　C. Buy medicine. D. Give her gifts.

10. Where can you find a gift idea to improve your mother's sleep?

　　A. In Gift No. 1. B. In Gift No. 2.

　　C. In Gift No. 3. D. In Gift No. 4.

11．Buying gifts from Presents for Purpose allows mothers to________．

　　A. enjoy good sleep B. be well­organized

　　C. get extra support D. give others help

　　D

Here is an astonishing and significant fact: Mental work alone can't make us tired.It sounds absurd.But a few years ago, scientists tried to find out how long the human brain could labor without reaching a stage of fatigue(疲劳)．To the amazement of these scientists, they discovered that blood passing through the brain, when it is active, shows no fatigue at all! If we took a drop