[单项选择]Sometimes an object in nature is so rare that it escapes mention in nature books. Such is the case with the delightful Kirtland’s warbler. The Kirtland’s warbler is a plump, yellow-breasted bird that can be found nesting almost exclusively in the upper half of Michigan’s Lower Peninsula. Although this bird does migrate to the Bahamas during the winter months, Michigan is its natural habitat. Unfortunately, reduced numbers have caused the Kirtland’s warbler to be designated an endangered species. The remaining Kirtland’s warblers now enjoy living among the jack pine trees located in protected Michigan forests. The male warblers generally return north before the female birds. Often, they return as early as May. When they arrive, the male warblers stake out their territories and choose a nesting area. At the completion of their own long journey from the Bahamas, the female warblers begin to collect leaves and grass to build their nests. Oddly, the Kirtland’s warbler nests on the ground an
A. disinterested in the fate of Kirtland’s warbler
B. a proponent of Kirtland’s warbler
C. a native of Michigan who travels to the Bahamas
D. reluctant to discuss the migratory patterns of Kirtland’s warbler
E. annoyed that Kirtland’s warbler is not mentioned in nature books

[单项选择]Sometimes an object in nature is so rare that it escapes mention in nature books. Such is the case with the delightful Kirtland’s warbler. The Kirtland’s warbler is a plump, yellow-breasted bird that can be found nesting almost exclusively in the upper half of Michigan’s Lower Peninsula. Although this bird does migrate to the Bahamas during the winter months, Michigan is its natural habitat. Unfortunately, reduced numbers have caused the Kirtland’s warbler to be designated an endangered species. The remaining Kirtland’s warblers now enjoy living among the jack pine trees located in protected Michigan forests. The male warblers generally return north before the female birds. Often, they return as early as May. When they arrive, the male warblers stake out their territories and choose a nesting area. At the completion of their own long journey from the Bahamas, the female warblers begin to collect leaves and grass to build their nests. Oddly, the Kirtland’s warbler nests on the ground an
A. Kirkland’s warblers do not merit mention in nature books
B. birds that migrate are considered native to the place where they build their nests
C. many bird species are so rare that they escape mention in nature books
D. most bird species in Michigan are well documented in scientific literature
E. Kirkland’s warblers are little known because of their limited numbers

[简答题] Information about tiger sharks is rare in books so most of this paper about sharks will be in general. The Tiger Sharks’’ Latin name is Galeocerdo Cuvier. Sharks are a member of the fish family. There are over 350 species of sharks. Sharks can be as big as 49 feet long (whale shark) and as short as 6 inches (cigar shark). Sharks’’ bodies do not have bones, but have cartilage (软骨) instead. They have pointed heads with five gills (I ) behind it. Sharks have very sharp teeth that are replaced whenever they lose teeth. Sharks’’ skin can be reddish brown, bronze, metallic blue or nearly black, although most of them are gray. Some have spots, bands and marbling. Their skin is leathery (粗糙) and covered with small pointed scales (鳞) which are so sharp that if petted in the opposite direction can actually hurt your hand. Sharks have great senses. Their eyes are sensitive and can even see in dim light. Their sense of smell is outstanding. They also have senses that humans do not. Sharks

[单项选择]I was blessed with a rare determination to make something of myself.（　）
A. ...I had a strong determination to begin a new life.
B. ...I had a great confidence in myself to become rich.
C. ...fortunately I was exceptionally determined to succeed.
D. ...naturally I was extremely confident to rely on nobody but myself.

[填空题]The balance of nature is to be maintained so as to prevent ______