Q: Read the following article and answer the question. Article: About us Summer Camps offer many programs that develop athletic skills, teamwork and healthy habits to kids. We create a safe and noncompetitive environment for learning and making friends. Our counselors are required to complete much training. Directors and head counselors are certified in CPR and First Aid and so on. Full-day Camp (ages 6-13) A typical camp starts with soccer, kickball, basketball or field games. After lunch, the kids do three activities. Depending on location, there are swimming, science and nature, arts and crafts, rope courses. Li'1 Rascals Day Camp (ages 3-5) Preschoolers get all the fun of full-day camp in half the time. Activities include arts and crafts, sports, games and relays. Each week has different themes. All participants must be able to be taught to use a patty . Specialty camps (ages 14-16) These specialty camps build many athletes. Our experienced staff will help your child be excellent in his or her favorite sport. *Tennis *Basketball *Soccer *Dance *Cheerleading Fee: $120 Contact Information Call: 068-990-3224; E-mail: summercampsforkids@hotmail.com or Write to: 125 Seventh Avenue South New York, NY 10014 What the parents from last year say about the camps: "All the activities were perfect. My son definitely wants to return next year and I will recommend the camp to others." --Kate "I think this is one of the best camps that my children have attended. The counselors and directors are enthusiastic and friendly. The programs are excellent and it is the only camp that they ask to go back to." --Jack "My children had an excellent time at your camp. I was very impressed by both your friendly, helpful counselors and directors and the excellent way that the entire camp was organized and run. I will consider next year! Many thanks." --Mary Question: It can be known from the parents that _ . Answer:

OPTIONS:
- the spaces of Summer Camps are limited
- the workers at the camps are responsible ones
- the campground of Summer Camps are tidy and comfortable
- Kate's son will attend the camps with his friends next time

A: the workers at the camps are responsible ones

Q: Read the following article and answer the question. Article: Two-thirds of the world's major rivers have now been disrupted with more than 50,000 dams in an attempt to stole water and provide power. In the US,there are more than 85,000 dams,disrupting large and small rives, and in most cases transforming natural flow.The most famous of these,the Hoover Dam, constructed in the l930's,is mainly responsible for the fact that the Colorado River no longer reaches the ocean. Dams, besides all their attractive benefits, also have negative impacts. Creating a reservoir means a large area must be flooded. Communities may lose their land, houses and culturally impotent sites. Environmentally, the new reservoir can be a paradise for wildlife, especially birds. However, it can cause greenhouse gas emissions and poison the water for fish. Also, the dramatic rise and fall of water levels during dam releases is too extreme for plains and animals to cope with, resulting in dead zones around the shores of reservoirs. Fish that lay their eggs in the shallows, for example, may find a few hours later that those sites are high and dry. Dams don't just block water flow. They also prevent fish migrations, and are a barrier to sediment flows. Instead of rushing downriver, sediments get backed up against the dam wall, which cause the reservoir level to increase over time.However, sediments which are rich in nutrients have become a problem. The fertility of the entire system can be influenced, with soils lost during seasonal rains not being replaced. Perhaps the biggest problem can be seen in deltas , often host to large cities,which are sinking into the oceans. Groundwater is being extracted to feed the city, causing the urban weight to sink and sediments washed away by the ocean are no longer being replaced. The result is that sea level rise in cities from Shanghai to Alexandria. Question: What does the text mainly talk about? Answer:

OPTIONS:
- Environmental benefits of dams
- Cultural loss of dams
- Economical gain of dams
- Environmental loss of dams.

A: Environmental loss of dams.

Q: Read the following article and answer the question. Article: Plants may not have eyes and ears,but they can recognize their siblings ,and researchers at the University of Delaware have discovered how.The ID system lies in the roots and the chemical signals they secrete . Canadian researchers published that sea rocket,a common seashore plant,can recognize its siblings.Susan Dudley observed that when siblings are grown next to each other in the soil,they "play nice" and don't send out more roots to compete.However,the moment one of the plants is thrown in with strangers,it begins competing with them by rapidly growing more roots to take up the water and mineral nutrients in the soil. After reading Dudley's study,Bais decided to find the method behind the sibling recognition.Working in his laboratory,Bais and his doctoral student Meredith Biedrzycki set up a study with wild populations of Arabidopsis thaliana.In a series of experiments,young seedlings were exposed to liquid media containing the root secretions from siblings,from strangers,or only their own secretions.The length of the longest lateral root was measured.The exposure of plants to the root secretions of strangers induced greater lateral root formation than exposure of plants to sibling secretions.Strangers planted next to each other are often shorter,because so much of their energy is directed at root growth.Because siblings aren't competing against each other,their roots are often much shallower . Biedrzycki did the _ laboratory research,observing more than 3,000 plants involved in the study every day for seven continuous days and documenting the root patterns."Arabidopsis roots are nearly translucent when they are young and were also twisted when I removed them from plates,"Biedrzycki notes."This manuscript is very important for my research since the focus of my thesis project is understanding the biochemical ways behind root secretions." The research also may have implications for the home gardener."Often we'll put plants in the ground next to each other and when they don't do well,we blame the... Question: Which of the following would be the best title for this passage? Answer:

OPTIONS:
- A Great Biology Researcher
- Plants Recognize Their Siblings
- Plants' Roots and Secretions
- A Research on Plants

A:
Plants Recognize Their Siblings