1 Scientists from the National Institutes of Health have identified an antibody from an HIV-infected
person that potently neutralized 98 percent of HIV isolates tested. This includes 16 of 20 strains
resistant to other antibodies of the same class. The remarkable breadth and potency of this antibody,
named N6, make it an attractive candidate for further development to potentially treat or prevent HIV
infection, say the researchers. The scientists, led by Mark Connors, M. D., of NIH's National Institute of
Allergy and Infectious Diseases (NIAID), also tracked the evolution of N6 over time to understand how it
developed the ability to potently neutralize nearly all HIV strains. This information will help inform the
design of vaccines to elicit such broadly neutralizing antibodies.
1. Which of the following best establishes the main idea of the passage as a whole?
A) NO CHANGE
B) 16 of 20 strains of HIV are resistant to other antibodies of the same class
C) The scientists tracked the evolution of N6 over time
D) The NIH does not approve of testing antibodies on HIV-infected patients,

Is the answer A, B,C or D

Match each excerpt with the type of essay it represents. descriptive essay narrative essay expository essay persuasive essay essay excerpt type of essay when hal arrives at the pond, a bleak sight greets him as he discovers the surface of the skating pond is layered with snow. realizing he is facing a monumental task, he industriously begins to shovel the mounds of new snow from the frozen pond. lifting shovelful after shovelful of heavy wet snow, hal tirelessly works. while he works, he dreams of his brilliant future as a magnificent hockey star. soon a massive pile of glistening snow begins to appear on the bank, and the icy surface of the pond is smooth glass. hal’s back and arms ache as he eagerly exchanges his work boots for an old, worn pair of hockey skates. arrowright potter's lake used to be the nicest lake in the area. but these days the water is green with algae, and the lake is choked with weeds all summer long. as a result, people can no longer swim in it. experts have determined the cause of the problem.fertilizers from yards and farms have been running into the lake. they cause algae and weeds to grow out of control. they also kill birds and fish. arrowright a hard, gray mountain loomed over a serene, florescent-blue lake, which gently lapped at its granite base. miles above the lake, a trio of mountain peaks jutted into the sky. each seemed to be topped with a chilled scoop of vanilla ice cream. as a cold and distant sun crept over the peaks, the lake and valley below instantly became suffused with blue light, which seemed to touch everything but warm nothing. morning had arrived. arrowright since 1897, the population of the bachman's warbler in north carolina has decreased from more than 500,000 to fewer than 100. the main reason is the destruction of areas (like asbury woodlands) that the bird uses for its natural breeding grounds. bachman's warblers prefer thickly wooded swamps and wet thickets in heavy, full-grown forests. it’s there that they can build their nests and feed on insects. this fact does not mean that we cannot build a community theater. we simply must not build it in asbury woodlands. after all, our community has forever prided itself on caring for our natural surroundings. with the council’s and the support of our townspeople, future generations will be able to continue to appreciate the beauty of this little bird

Read this excerpt from wheels of change by sue macy.that said, it's hard to grasp the full extent of the bicycle's impact on americans in the late 19th century—particularly female americans. imagine a population imprisoned by their very clothing; the stiff corsets, heavy skirts, and voluminous petticoats that made it difficult to take a deep breath, let alone exercise. add to that the laws and social conventions that cemented a man's place as head of the household and holder of the purse strings. how suffocated women must have felt. and how liberated they must have been as they pedaled their wheels toward new horizons.what is the central idea of the excerpt

Each pair of sentences can be combined to create one compound sentence. determine which choice best combines them. refinishing furniture is a creative hobby. not everyone loves to scour garage sales to find old items. going to flea markets can you to notice unique qualities in used items. beauty can be found where you least expect it. specialized equipment can make the refinishing process easier. painting the furniture can be creative with the right tools. some people like refinishing old furniture. others prefer buying new items.