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目前我国货币市场基金能够进行投资的金融工具不包括( )。
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严格意义上的ETF最早出现在( )。
A pet is an animal that (21) in your house. Over half the families in North America own pets. The most popular (22) are dogs, fish and birds. Rabbits, hamsters and turtles are also popular. Even some unpopular animals such as frogs, mice and snakes are pets.People first (23) to keep pets about 12,000 years ago. The first pet was a dog. The dog did not become a pet because people (24) it was cute. It became a pet because it was useful. People used the dog for many things. The dog warned people (25) danger so wild animals didn’t attack people. It also ate left-over food. Later, dogs helped people take care (26) cows and sheep on farms.Cats did not (27) pets for a long time. When the Egyptians first started to grow grain, mice ate it. The Egyptians were (28) to tame cats.Today, people keep many (29) of pets. Animals such as canaries, parrots, mice and hamsters live in cages. They need people to bring them food and water and to keep their cages clean. Other animals, such as dogs and cats, need food and water, but they can take care of themselves (30) .They are good pets for people because they don’t need much care. 29（）
Passage FiveAlthough no one is certain why migration occurs, there are several theories. One theory is based upon the premise that prehistoric birds of the northen Hemisphere were forced south during the Ice Age, when glaciers covered large parts of Europe, Asia, and North America. As the glaciers melted, the birds came back to their homelands, spent the summer, and then went south again as the ice advanced in winter. In time, the migration became a habit, and now, although the glaciers have disappeared, the habit continues.Another theory proposes that the ancestral home of all modern birds was the tropics. When the region became overpopulated, many species were crowded north. During the summer, there was plenty of food, but during the winter, scarcity forced them to return to the tropics.A more recent theory, known as photoperiodism, suggests a relationship between increasing daylight and the stimulation of certain glands in the birds’ bodies that may prepare them for migration. One scientist has been able to cause midwinter migrations by exposing birds to artificial periods of daylight. He has concluded that changes occur in the bodies of birds due to seasonal changes in the length of daylight. According to one theory, when the glaciers disappeared, birds （）
目前我国各家商业银行推广的外汇结构化理财产品等都是( )。
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