Children with autism  have difficulty with social skills and communication. They often behave in restricted and repetitive ways and have what seem like abnormally intense interests. Autism is more common in boys than girls. What causes it is not clear. Scientists are studying genes and possible environmental influences. Doctors usually cannot confirm a diagnosis  of autism until a child is about three years old. Rebecca Landa is a researcher at the Kennedy Krieger Institute and Johns Hopkins University School of Medicine in Maryland. Professor Landa wanted to find out what differences in development might be seen earlier. She led a new study that observed 235 babies between six and 36 months of age. "At six months of age, the signs of some risk for developing communication and social delays, including autism, include motor delays. Like when you lay your baby on their back and you pull them by the arms gently into a seated position, the baby's head may nod back behind the shoulders, like poor head control. So that does not mean that the baby is going to have autism, but it does mean the baby needs to have some exercises to strengthen their body. And when they strengthen their body, they are better able to play with toys and engage with people, which then goes on to help them have better outcomes." By the time a baby is one year old, signs of possible autism include difficulty in using words and not looking eye-to-eye or reaching out to other people. By 14 months, the baby might smile less and use language less. However, Professor Landa says these signs can be so small that they might be missed during a short health exam. "It's important for parents to stay tuned into their children's development, and if a parent is concerned about a child's development, for professionals to listen to them." The earlier parents notice delays, she says, the sooner they can begin doing simple things that may help improve their child's development. For example: talking to the child about what they are doing, commenting when the... What is the best title of the passage? A) Watching for Early Signs of Autism in Babies B) How to Confirm a Diagnosis of Autism C) Children with Autism Have Difficulty in Communication D) Ways to Help Children with Autism to Recover
A


One hundred and fifty years ago, the world's first underground railway began operating in London, running for just six kilometres from Paddington to Famngdon.Today, the network covers 408 kilometres, with 11 lines running through 270 stations.And despite every major city in the world now having its own metro system, London's is still the second-longest (Shanghai's is the first).It's no surprise that locals and travellers will all be wishing London's "Tube" a very happy 150th birthday. Londoners have an unspoken code of conduct when they travel on me Tube, and a bit of local knowledge is essential for getting around the British capital.Here we provide some tips and etiquette   for your next visit to London.          Do... Stand on the right on escalators  , walk on the left -Londoners will be quick at reminding you should you forget this.          Let other passengers off before getting on.          Give up your seat if someone needs it more than you.          Mind the gap (between the train and the platform edge) -they are sometimes pretty wide.          Don't...          Block doorways-move down inside the carriages.          Talk to people you don't know.Even if the train is delayed you should merely sigh or shake your head, rather than strike up a conversation.          Travel on the Hammersmith & City or Circle lines if you can help it-they have a poor record for delays and disruptions.          Expect air-conditioning-the low tunnels mean there's no space on most lines to install air-con equipment so expect to set hot and sweaty in summer. On the London Underground, passengers are supposed to   _  . A) urge people to walk on the right B) get on quickly when the Underground arrives C) greet the people sitting next to them D) tolerate the heat in the carriages
D


Q: Australian scientists are trying to give kangaroo-style stomachs to cattle and sheep in order to cut the greenhouse gases they send out, which is thought to be responsible for global warming.    Thanks to special bacteria in their stomachs, kangaroo flatulence contains nomethane  and scientists want to transfer that bacteria to cattle and sheep who produce large quantities of the harmful gas.    While the usual image of greenhouse gas pollution is a billowing smokestack pushing out carbon dioxide, farm animals' passing wind contributes a surprisingly high percentage of total emissions in some countries.    "Fourteen percent of emissions from all sources in Australia is from enteric  methane from cattle and sheep," said Athol Klieve, a senior research scientist with the Queensland state government.   "And if you look at another country such as New Zealand, which has got a much higher agricultural base, they're actually up around 50 percent," he said.    Researchers say the bacteria also make the digestive process much more efficient and could potentially save millions of dollars in feed costs for farmers.   But it will take researchers at least three years to isolate the bacteria, before they can even start to develop a way of transferring it to cattle and sheep.   Another group of scientists, meanwhile, has suggested Australians should farm fewer cattle and sheep and just eat more kangaroos. And about 20 percent of health-conscious Australians have eaten the national symbol already.   "It's low in fat, it's got high protein levels and it's very clean in the sense that basically it's the free-range animal," said Peter Ampt of the University of New South Wales's institute of environmental studies. The passage is written mainly to   _  . A) discuss a better way to protect the earth B) warn farmers of the danger of animal waste C) illustrate the possible solutions to pollution D) present a recent study on one cause of global warming
A: D


Come out and let us teach you how to skydive today! We are located in Xenia, Ohio and is within a reasonable driving distance of major cities in Ohio. Situated on a private airport, Skydive Greene County offers world-class training. We didn't start skydiving but we are Ohio's oldest skydiving school which opened in 1961! Tandem Skydiving Tandem skydiving is required if this is your first time skydiving. After filling out paperwork and watching a short video, you will be ready to make your skydive. Somewhere around 11,500 feet you will be secured to your tandem instructor. The door will open and you exit the plane. Your freefall with your instructor will last for approximately 40-50 seconds. We can almost guarantee this will be the most exciting minute of your life as you reach the speed of around 120 mph, falling for about two miles back to the earth! Don't forget to have a video taken of your skydive to show all those that didn't think you would jump from an airplane! Static Line Courses Once you have made your tandem skydiving, you can move on to our Static Line Program. The Static Line Jump is the traditional way to learn to skydive. We have classes throughout the year. Every student will be led through the entire day by a licensed instructor. Never does the student feel unattended. Once training is over, students will make their first jump on that very same day! If the weather does not cooperate, you can come back the next day, or we will re-schedule a time to make your skydive. Price $165.00 Tandem skydiving only $175.00 Static Line Course only Invite one of our professional videographers on your skydive: $125.00 DVD with photos Booking To book your tandem skydive or skydiving course, call us at (937) 372-0700. We just ask for a call if you cannot keep your scheduled appointment. And you must be at least 18 years old to make a skydive at SGC. Come to learn with the best and make a skydive today! For further information, please call us at (937) 372-0700 or visit ourwebsite www. greenecounty.com! To book a skydive in SGC, one must  _  . A) telephone SGC B) fill in some forms C) visit SGC's website D) keep the appointment

A