THE AGREEMENT ENDED SIX-MONTH NEGOTIATION. IT WAS SIGNED YESTERDAY.30

30:The agreement ended six-month negotiation. It was signed yesterday.A. The agreement which was signed yesterday ended six-month negotiation.B. The agreement which ended six-month negotiation was signed yesterday.C. The agreement which was signed yesterday lasted six months.D. The negotiation which lasted six months was signed yesterday.Read the following passage and circle the letter A, B, C, or D on your answer sheet toindicate the correct answer to each of the questions.Broad-tailed hummingbirds often nest in quaking, slender deciduous trees with smooth,gray-green bark found in the Colorado Rockies of the Western United States. After flyingsome 2,000 kilometres north from where they have wintered in Mexico, the hummingbirdsneed six weeks to build a nest, incubate their eggs, and raise the chicks. A second nest isfeasible only if the first fails early in the season. Quality, not quantity, is what counts inhummingbird reproduction.A nest on the lowest intact branch of an aspen will give a hummingbird a good view, aclear flight patch, and protection for her young. Male hummingbirds claim feeding territoriesin open meadows where, from late May through June, they mate with females coming to feedbut take no part in nesting. Thus when the hen is away to feed, the nest is unguarded. Whilethe smooth bark of the aspen trunk generally offers a poor grip for the claws of a hungrysquirrel or weasel, aerial attacks, from a hawk, owl, or gray jay, are more likely.The choice of where to build a nest is based not only on the branch itself but also onwhat hangs over it. A crooked deformity in the nest branch, a second, unusually close branchoverhead, or proximity to part of a trunk bowed by a past ice storm are features that provideshelter and make for an attractive nest site. Scarcely larger than a halved golf ball, the nest ispainstaking constructed of spider webs and plant down, decorated and camouflaged outsidewith paper-like bits of aspen bark held together with more strands of spider silk. By earlyJune it will hold two pea-sized eggs, which each weigh one-seventh of the mother’s weight,and in sixteen to nineteen days, two chicks.