[单项选择]Each person in the world has a(n)______ personality. They are different from one another.
A. only
B. sole
C. unique
D. one

[单项选择]Each has an apple, ______

[单项选择]Which of the following world organizations has the weakest leadership according to the passage
A. The International Labor Organization.
B. The Food and Agriculture Organization.
C. The World Health Organization.
D. The World Bank.

[单项选择]To ______ the world peace has been one of the most crucial functions of the United Nations since it was founded in 1945.
A. sustain
B. maintain
C. contain
D. retain

[单项选择]Each species has certain（）features.
A. distinguish
B. distinguished
C. distinct
D. distinctive

[单项选择]Each country has to import the articles and commodities it does not itself ______.
A. produce
B. increase
C. design
D. sell

[单项选择]

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
Spread spectrum simply means that data is sent in small pieces over a number of the （）frequencies availablefor use at any time in the specified range. Devices using （） spread spectrum (DSSS) communicate by （） each byte of data into several parts and sending them concurrently on different （） . DSSS uses a lot of the available （） , about 22 megahertz (MHz).

Spread spectrum simply means that data is sent in small pieces over a number of the （）frequencies availablefor use at any time in the specified range.
A. continuous
B. high
C. low
D. discrete

[单项选择]The World Cup has been the ______ of this month's events; a large number of soccer fans around the world focus their attention on the little "ball".
A. twilight
B. realms
C. highlights
D. headlines

[单项选择]According to the passage, each nest has a distinct odor that allows its inhabitants to
A. (find the location of the nest in the dark
B. ( distinguish worker ants from other ants
C. ( distinguish foreign ants from resident ants
D. ( signal other inhabitants when foreign ants attack

[单项选择]______ their country has plenty of oil, ours has none.
A. While
B. Where
C. When
D. Unless

[单项选择]

Each scientific specialty has its own set of journals. Physicists have Physical Review Letters, cell biologists have Cell, neuroscientists have Neuron, and so forth. Science and Nature, (1) , are the only two major journals that (2) the complete range of scientific (3) . As a result, journalists look (4) them each week for the (5) of new science papers. And scientists look to the journals (6) to reach journalists. Why do they care Competition for (7) has gotten so fierce that scientists have sought popular (8) to gain an advantage over their (9) . Publication in specialized journals will win the honor of academics and satisfy the publish-or-perish (10) , but Science and Nature come with the added bonus of potentially getting your paper written up in The New York Times and other publications.
Scientists are also trying to (11) other scientists through Science and Nature, not just the public. The l
A. rough
B. harsh
C. rude
D. uneven