Question: SEOUL North Korea shut down its Punggye-ri nuclear test site on Thursday to demonstrate its commitment to denuclearization in advance of the planned U.S.-North Korea summit. The development came hours before President Donald Trump called off the highly anticipated meeting. The South Korean government welcomed the North's unilateral nuclear concession to help facilitate a broader agreement with the United States to completely end its nuclear weapons program in exchange for ending punishing sanctions and security guarantees. "We are hoping that this action will become the opportunity for complete denuclearization in the future," South Korea Foreign Ministry spokesman Noh Kyu-duk said. However, while the closure of the nuclear test complex is a significant symbolic gesture, analysts are skeptical it will seriously inhibit the Kim Jong Un government's ability to carry out further nuclear tests in the future. "That renders the test site unusable, but not forever and it's not like North Korea has a shortage of mountains or people to make new tunnels," said Jeffrey Lewis, the director of the East Asia Nonproliferation Program at the Middlebury Institute of International Studies in California, during an interview with Vice News. North Korea conducted all six of its nuclear tests at the Punggye-ri underground site that includes at least two extensive tunnel systems, according the 38 North website that monitors the North's nuclear activities. Each nuclear test conducted at the site was progressively more powerful, with the first bomb detonated in 2006 producing an estimated 1-2 kiloton yield, much less powerful than the 16-kiloton bomb the United States used on Hiroshima during World War II, and the last test in 2017 producing close to a 250-kiloton yield. There were reports that the last nuclear test in September of 2017 triggered a tunnel collapse rendering the site unusable, but analysts say there were still two other tunnels that could be used for future tests. Earlier this year North Korean leader Kim Jong Un... After the end of the story, North Korea probably: A. built more nuclear test sites B. shut down more nuclear test sites C. didn't shut any more test sites down D. not enough information
Answer: B

Question: Dietary supplements are big business, with around half of the Australian population using at least one type per year; most commonly a multivitamin and mineral pill. Many people take supplements as a form of dietary insurance in case they are not meeting their nutrient needs from foods alone. Others take them as a form of health insurance to protect against certain diseases. Some just take them out of habit. Supplements do have a role to play in some situations. People with a diagnosed deficiency, those with malabsorption conditions, women planning pregnancy, and people with very poor diets all can benefit from specific nutrient supplementation. But what about the benefit of supplements across the broad population? The mantra of most health professionals, which is even etched on the label of many supplements, is that supplements may only be of assistance if dietary sources are lacking. To see if this is supported by solid evidence, a systematic review of 63 clinical trials involving some form of supplementation in non-pregnant adults was carried out by a team of medical researchers. The clinical trials were broad in their nature with many nutrients studied including vitamins A, B6, B12, C, D and E; folic acid; calcium; selenium, omega-3 fatty acids; ginkgo biloba; glucosamine; saw palmetto; and milk thistle. All of the studies were randomised controlled trials and evaluated a range of health outcomes including risk of heart disease, cancer, diabetes, bone fractures, cognitive function and all-cause mortality. From the 63 studies, no benefit was seen in 45 studies with 10 of these showing a trend towards harm and just two showing a trend towards a benefit. Of the remaining studies, four showed harm with a greater risk of cancer with beta-carotene and a higher risk of fractures with a once-yearly dose of vitamin D. One study showed a lower risk of cancer with selenium supplementation, but this was not validated in much larger trials. Twelve studies showed a benefit and these mostly involved vitamin D... What effects did the scientists study? A. Positive effects B. not enough information C. Dietary effects D. Negative effects
Answer: A

Question: I was lost. As I sat parked at the old service station, I pulled out the maps and tried to do a little backtracking. It didn't take me long to figure out where I had made the wrong turn. I had tried following my memory instead of Luna's directions and wound up about eighty miles off course. My gas tank was pushing 'E' but fortunately the service station was open. When I stepped out of my Jeep, I could feel the soles of my boots melt on the asphalt. The heat coming off the cracked and pitted cement peeled off in waves that rolled out in every endless direction. The barren mountains in the distance looked unstable, like I was looking at them through a window pane slicked with olive oil. I slogged my way over to the gas pump and wrapped my shirt around the handle to keep my skin from burning against the desert-baked metal. The heat was so great I worried the fumes would ignite. A dirty round man stood in the shadowy doorway of the ramshackle service station and stared at me while he rubbed his hands inside an oily red rag. The oval name-patch stitched to his coveralls was loose at one end and curled like a leaf in the heat. His name was Jack. I topped off the tank and then walked over to him. "You work here?" I knew it was a stupid question the second it left my mouth. He and I were the only living things for fifty miles in any direction. Who the hell else would be working here? "Who the hell else would be working here?" he said. I shrugged my shoulders and pulled out my wallet. Jack wobbled inside behind a glass counter filled with everything from belt buckles to oil funnels. "That your momma's car?" he asked. It's impossible to tell what kind of psychological impact this heat would have on a man who lived out here alone, but I was sure it wasn't positive. What kind of effect does the narrator believe the heat could have on a person? A. not enough information B. A positive effect. C. A negative effect. D. No effect.
Answer:
C