Are you carrying too much on your back at school? I’m sure lots of children of your age will say “Yes”. Not only the students in China have this problem, but children in the United States also have heavy school bags.
Doctors are starting to worry about young students’ back and neck because their school bags are too heavy for them.
“It’s hard for me to go upstairs with my heavy bag,” said Rick Hammond, an ll-year-old student in the USA.
Rick is among students who have school bags with two straps(带子),and many other students choose rolling(有滚轮的) bags.
But even with rolling bags ,getting upstairs is still a problem for children .Doctors say students should carry no more than 10% to 15% of their own body weight (重量)。
Scott Bautch, a back doctor, said children under Grade 4 should carry no more than 10% of their weight and older children shouldn’t stay with over 15% , because their bodies are still growing.
Teachers and parents should do some things to help children. And the best answer is to have less homework!
【小题1】From the passage we cam know that        .

School activities for kids and teens
July is a month of fun-filled activities for kids and teens as long as you know where to find them. When you want some fun activities for July, consider these ideas happening in this month.

Secret of the Dragon Time     Monday, July 1, 2013, 10:30 am Cost     Adult: $ 7.40 children (number 15 years): half Bookings  Phone the booking office: 3403 2578 Address   Brisbane Botanic Gardens Note      Secret of the Dragon is a magical story about two children who are taken on a dragon ride to expel the universe.	The Search for Life: Are We Alone? Time    Thursday, July 4, 2013, 2:00 pm Cost     Adult: $ 14.50 Children (under 15 years): $ 8.70 Bookings  Phone the booking office: 3403 7689 Address   Brisbane Botanic Gardens Note      Are we truly alone in space? Is there any life out there? These are the questions asked in this show.
Magic Class Time     Friday, July 12, 2013, 10:00 am Cost      Free Bookings  Please call 3403 8470 to book your place. Address   Centenary Community hub, 171 Dandenong Rd Note      Would you like to be a magician? Then join David, the magician, to learn about real magic with playing cards, coins, ring ropes and DIY projects and be able to become the life of the party.	Science with Me: Making your own guitar Time      Saturday, July 20, 2013, 3:00 pm Cost       Free Bookings   Please phone 3403 1226 to book your place. Address    10, Egginton Close Note       Do you want to make a guitar with Katy and her mom? Science with Me is going to be with you. Please remember to bring a piece of wood, a hammer, some rubber bands and some nails with you.

Today there are 6 billion people on the earth. By the year 2050 there may be 12.5 billion. There will be a lot of people to feed. We need more food.
One way to produce more food is by growing stronger plants. For thousands of years, farmers have made plants better. Every season, they pick the best plants for the next season. It works very slowly. Since 1983, scientists have been able to change plants more quickly by changing their genetic material(遗传物质). Foods from plants grown in this way are called genetically modified foods(转基因食品), or GM foods.
By changing the genetic material of a plant, it is possible to make new plants. They make plants which are strong against plant diseases. They can also help in our diseases: a kind of rice is being prepared, for example, which stops people from becoming blind.
Rich countries produce GM foods because they are easy to grow and bring in more money. Poor countries are interested in them because they help produce more food.
GM plants are not natural. No one knows how good or bad they are. Making GM foods is only one way of feeding people in 2050. There are strong feelings against them, because they are unnatural. They may feed people, then hurt them or their children later. But, both rich and poor countries are very interested in their use, and they are not going to go away. In 2050 we may think differently about them.
【小题1】GM foods ________.

A. May I help you ?

B: Yes, please. I’d like the blue pants. Can I    61     them on?

A: Sure. Wow! They look very nice     62     you.

B: But I think     63    too small.

A: How do you like this    64   of pants?

B: Let me see. Oh, they are OK . How much are they?

A：They are 390 yuan.

B: 390 yuan ? Are you      65   ? I’ll think about them. Thank you all the same.