[单项选择]Most Americans live according to time segments laid out in engagement calendars.（　）
A. Most Americans carry a calendar with them wherever they go.
B. Most Americans have a calendar to write their engagements on.
C. Most Americans plan their time carefully and follow a strict schedule.
D. Most Americans only meet people who have made an appointment with them.

[填空题]

What is very important to Americans according to the passage
They should buy medical （）

[单项选择]The most crucial time for project risk assessment is （）
A. when a problem surfaces
B. during the planning phase
C. during the close-out phase
D. after the project schedule has been published

[单项选择]According to the author, Americans' cultural blindness and linguistic ignorance will ______.


A. affect their images in the new era
B. cut themselves off from the outside world
C. limit their role in world affairs
D. weaken the position of the US dollar

[单项选择]According to the fifth paragraph, Americans who change their jobs usually ______.


A. prefer small towns to big cities
B. feel reluctant to move more than several miles away
C. thinks it worthwhile to move to a foreign country
D. dislikes moving to faraway places

[填空题]24 According to Ms Costa, how much Americans spend on leisure has been directly affected by salaries and ..........

[填空题]According to recent surveys， 72% of all Americans believe that the United States government is （46） hi____ information about UFOs. Almost 68% of people think that the government has secret knowledge of extraterrestrial life. It is not （47） ____ （surprise） that the government has come under more and more（48）pr____ to declassify its UFO records and make them public. A variety of different groups have been involved in these efforts. One group to become involved is called CFI， the Coalition for Freedom of Information， John Podesta， who was White House Chief of Staff during Bill Clinton’s （49） ____ （president）， is one of the many high-powered people active in this group. CFI’s aim is not to prove the（50）____（exist）of extraterrestrial life，but to make it easier for scientists in general to study unexplained aerial phenomena. Podesta and his group has asked the Pentagon to declassify its UFO records and therefore provide scientists （51） ____ data that will help in the study of UFOs. CFI ha

[单项选择]
Most of the time, the ground feels solid beneath our feet. That’s comforting. But it’s also misleading because there’s actually a lot going on underground. Masses of land (called plates)slip, slide, and bump against each other, slowly changing the shape of continents and oceans over millions and billions of years.
Scientists know that Earth formed about 4.5 billion years ago. They also know that our planet was hot at first. As it cooled, its outermost layer, called the crust (地壳), eventually formed moving plates. Exactly when this shift happened, however, is an open question.
Now, an international group of researchers has an answer. They’ve found new evidence suggesting that Earth’s crust started shifting at least 3.8 billion years ago. The new estimate is 1.3 billion years earlier than previous ones.
Not long before 3. 8 billion years ago, lots of asteroids (小行星) were hitting Earth, keeping its crust in a ho
A. Right
B. Wrong
C. Not mentioned