[单项选择]The most important economic activity in Canada is ______.
A. mining B. fishing
C. farming D. manufacturing

[单项选择]The most important economic activity in Canada is


A. mining.
B. fishing.
C. farming.
D. manufacturing.

[单项选择] -----was the most important economic activity in the US until about 1800.
A. Agriculture, which
B. If agriculture
C. Agriculture
D. There was agriculture

[单项选择]Manufacturing is Canada's most important economic activity, （　）17 percent of the workforce.
A. to engage
B. being engaged
C. engaging
D. engaged

[单项选择]As a project manager, the most important activity to ensure customer and stakeholder satisfaction is （）.
A. documenting the performance measurements
B. reporting changes and updating the project plan and other project documents where appropriate
C. reporting project status timely and regularly
D. documenting the requirements

[单项选择]Watching television is an important activity of children. Children in the United States watch an average of three to four hours of television a day. By the time of high school graduation(毕业), they will have spent more time watching television than they have in the classroom.
Time spent watching television takes away from important activities, such as reading, school work, playing, exercise, and family talks. Children who watch a lot of television are likely to.
· Have lower grades in school
· Read fewer books
· Have problems with attention
· Exercise less
· Be too fat
Parents can help by:
· Watching programs with children
· Selecting appropriate (恰当的) shows
· Placing time limits on the television watching
· Turning off the TV during family meals and study time
Choose shows that meet the developmental (发展的，成长的) needs of your child. Some children’s shows on TV are good, but soap operas, and adult talk shows are not. Set certain
A. the advantages and disadvantages of watching TV
B. the disadvantages of watching TV and suggestions for the parents
C. the disadvantages of watching TV

[单项选择]Television plays a very important part (21) most people’s lives. It changes (22) way of seeing the world; it helps people know (23) in the world; it shows people and places in other countries. Children needn’t (24) to the zoo to see animals or (25) to see the ships. They can watch a play, a concert or a game (26) the television set. (27) , people can make themselves relaxed after one day’s work. However, some children spend four to six hours (28) TV, or even longer on weekends. Sometimes the program is not fit (29) children, so the parents should find them (30) to do.
A. when is happening B. what is happening C. what happening is