更多"Orchids are unique in having the mo"的相关试题:
[单项选择]Orchids are unique in having the most highly developed of all blossoms, in which the usual male and female reproductive organs are fused in a single structure called the column. The column is designed so that a single pollination will fertilize hundreds of thousands, and in some cases millions, of seeds, so microscopic and light that they are easily carried by the breeze. Surrounding the column are three sepals and three petals, sometimes easily recognizable as such, often distorted into gorgeous, weird, but always functional shapes. The most noticeable of the petals is called the labellum, or lip. It is often dramatically marked as an unmistakable landing strip to attract the specific insect the orchid has chosen as its pollinator.
To lure their pollinators from afar, orchids use appropriately intriguing shapes, colors, and scents. At least 50 different aromatic compounds have been analyzed in the orchid family, each blended to attract one, or at most a few, species of insects
A. the habitat in which it lives
B. the structure of its blossom
C. the variety of products that can be made from it
D. the length of its life
[单项选择]Courtesy is often nothing more than a highly developed sense of fair play.（）
A. 待人彬彬有礼要有一种高度的公正意识。
B. 对人彬彬有礼只不过是待人公正的一种高度体现。
C. 礼貌待人常常只是一种高度公平意识的体现。
D. 礼貌就是一种高度的公平竞赛。
[简答题]Which province is the most highly developed part of Canada
[单项选择]
The Bedouin people think most highly of people who show loyalty. To them loyalty does not mean that one is devoted to a country, a place, or a leader. Loyalty means being faithful to one’s family and tribe.
The Bedouin take pride in their ancestors. They do not admire a hero from an ordinary or poor family as much as one who comes from an ’honored family. They particularly respect those who have inherited a good name and then have passed it on to their children.
A man’s position among the black-tent people depends upon his ancestors, relatives, and fellow tribesmen. If they are honored, he is also honored. If they are disgraced, he too is disgraced. Therefore one carefully guards the honor of his family, his lineage, and his tribe.
A man can protect his family’s honor by being brave and generous and by giving protection to those who ask for it. He also guards it by carefully watching the women of his family.
A Bedouin woman
A. doesn’t love his country as much as his family
B. does nothing when a family member is insulted
C. doesn’t respect his leaders and superiors
D. doesn’t give protection to those who ask for
[填空题]A Nobel Prize is one of the most highly regarded ______ honors.
[填空题]
A Nobel Prize is one of the most highly regarded international honors a person can achieve. These prizes were named after Alfred Nobel, a Swedish chemist and inventor. The first Nobel Prizes were awarded in 1901, five years after Nobel’s death. Many famous people from all over the world have been awarded Nobel Prizes for their achievements. There are five different prizes: three in various sciences, one for literature, and the Peace Prize. But bow did these prizes start
Alfred Nobel was a chemist. He invented dynamite. As a result of his invention, he became a very wealthy man. He used part of his money to invest in oil. He made good investments, and became even richer. Nobel was not a happy man. He never married or had children. Also he was a sick man for the larger part of his life. Nobel died at the age of 63 in 1896. In his last will, he wished his property to be contributed to the establishment of prizes for achievements in physics, chemistry, medicine, literat
[填空题]
Learning specialists found most boys are having, while young girls are thriving in schools.
[单项选择]For most of the past three years, the highly pathogenic bird flu known as HSNI has been found mainly in Asia. Suddenly it has arrived in many countries in Europe, triggering widespread alarm. The detection of the virus in wild birds across Europe is certainly a cause for concern, particularly to Europe’s poultry farmers, who are rightfully worried that the presence of the virus in wild birds will increase the risk to their flocks. However, in the midst of a European debate about the benefits of vaccinating chickens and whether or not poultry should be brought indoors, there is a danger that far more significant events elsewhere will be overlooked.
In particular, most attention should be focused on the fact that bird flu is now widespread in the poultry flocks of two nations in Africa—Egypt and Nigeria—and in India. And on the fact that, in Nigeria, the disease is continuing to spread despite great efforts undertaken by the government. An outbreak in Afghanistan also appears to be
A. inform readers of the widespread bird flu
B. express his sympathy for poor countries
C. call for the solution of the problem in Africa
D. argue about the rapid spread of bird flu in Africa
