I'm taking a test and have to guess the right answer to the question after the article. Article: Scientists who discovered a new way of generating electricity from water say they may have come across an alternative source of clean energy to rival wind and solar power. The breakthrough, which scientists say is the first new way to generate electricity in 160 years, could lead to batteries that use water instead of poisonous substances. The scientists made the discovery when they were investigating what happens when tap water is forced through extremely narrow glass tubes. Water squeezed down the tubes, each of which was narrower than a tenth the thickness of a human hair, generating a small electric current that ran the length of the tube. To produce a larger electric current, the team tried forcing water through a glass water filter that contained thousands of narrow channels lined up side by side. "When we took a syringe of water and squeezed it through the filter, we got enough power to light a light bulb," said Larry Kostiuk of the University of Alberta in Canada. "The harder you push the syringe, the more electric current you get." The current is produced because of an effect in the glass tubes. When they are filled with water, positively charged ions fixed in the tubes are washed away, leaving a slight negative charge on the glass surface. When water is then forced along the tube, the surface _ negatively charged ions in the water while positively charged ions are attracted down the tube. The result is a net flow of positively charged ions that sets up an electric current. According to Dr Kostiuk, no one has ever thought to use water to produce electricity in this way. "The last time someone came up with a way of generating electricity was Michael Faraday in 1839," he said. "So this is the first new way of generating electricity in 160 years, which is why we are so excited about it." Dr Kostiuk says water batteries might one day be used to power mobile phones and calculators, but admitted that the engineering challenges might make other applications more realistic. "You'd need to be sure it wouldn't... Question: What can we infer about potential water batteries? Options: A: They must be used to power mobile phones and calculators. B: They have some possible disadvantages like water leaking. C: They would be needed greatly at city water filtration sites. D: They would be better than wind and solar power.
B

I'm taking a test and have to guess the right answer to the question after the article. Article: A speech is a wonderful opportunity to inform, persuade or entertain. The best speeches often take on a combination of all three of these components . However, before you can go about the writing of a great speech, it is important to set goals. Goals keep you,your speech and your audience focused. What a goal is In the context of a speech, a goal is the purpose of the speech, and what it hopes to accomplish. For example, the goal of a eulogy might be to celebrate the life of a loved one. The goal of a speech at a political gathering would be to inform the crowd about the political position of a candidate and persuade them to vote and campaign for the candidatein question . Why a goal is important Without a goal, a speech is without direction. The goal informs the structure and content of the speech. For example, if a speech's goal is to convince people that smoking is bad for them, the speech will be structured with persuasive arguments to back up the goal. A speech with a goal of informing the audience will keep the information fair and factual. A goal is incredibly important to the speech's ability to connect with an audience. If the speaker is unaware of the goal of the speech, the audience will likely be unaware as well. This severely reduces the effectiveness of the message. Aside from informing the audience of the content and structure, a speech's goal drives the speaker to greater heights. If a speaker is asked to speak on a specific subject, but never establishes the goal, they won't know where to start in the research, organizing and writing of the speech. _ If you have been charged with delivering a speech, establishing a goal can seem difficult at first. There are several things to take into consideration. First, think about who you will be speaking to. The demographic of your audience will likely determine whether you will be able to persuade them, or whether they will be able to sit through(......). Second, think about the topic itself. If the topic is something controversial , it may worth... Question: All the following indicate the importance of a speech goal EXCEPT that _ . Options: A: a speech will lose its direction without a goal B: a speech goal can help keep the audience aware of the speech C: a speech goal can help the speaker know about the research, organizing and writing D: a speech goal makes it possible for the speaker to achieve whatever he wants in life
D

I'm taking a test and have to guess the right answer to the question after the article. Article: Howard Dill is a giant among giant pumpkin growers. He grew world champion pumpkins for four years running,from 1979 to 1982, and missed winning the fifth year by only 5 pounds. Today, his Dill Atlantic Giant seeds are sold worldwide to more than 50 seed companies. The pumpkins grown from his Dill Atlantic Giant seeds commonly weigh in at over 1,000 pounds. "I don't have any training in genetics ; it was all trial and error," Dill says. He got his love of pumpkins from his father and has enjoyed growing them for years. Dill still grows giant pumpkins, but not for competition. In the fall, visitors come to enjoy the pumpkins on his 90-acre farm in Nova Scotia, Canada. He plants ten acres of pumpkins for Halloween and two acres of giant pumpkins. One of giant pumpkins was recently baked into 442 pumpkin pies and sold at $5 each for charity. It you want to try growing a giant pumpkin, Dill recommends starting with a soil test and then adding fertilizer as needed. Plant the giant pumpkin seed. A giant pumpkin can gain 15 to 20 pounds a day, so careful watering--every day or two--is necessary. You should wait about 130 days until the pumpkin matures and then you can harvest it. Dill's favorite pumpkin set the Guinness Book record in 1981. It weighted 493.5 pounds. "I've grown them larger since, but that one meant a lot," he remembers. "I never would have imagined ten years ago that there would be a 1,000-pounder, but there are many of them now," says Dill. The 2006 world record holder is Larry Checkon of Pennsylvania. He grew a 1,469 pounder. Dill says, "These world champions are grown from my seeds, so I feel like a winner right along with them." Question: Which of the following is the best title for the passage? Options: A: Gardening Giant: Howard Dill B: World Champion Pumpkin C: Dill Atlantic Giant Seeds D: How to Grow Giant Pumpkins
A