[单项选择]

Have you ever had to decide whether to go shopping or stay home and watch TV on a weekend Now you (21) do both at the same time. Home shopping television networks (网络)have become a (22) for many people to shop without (23) having to leave their home.
Some shoppers are (24) of department stores and supermarkets—fighting the crowds, waiting in long lines, and sometimes having slight (25) of finding anything they want to buy. They’d rather sit quietly at home in front of the TV set and watch a friendly announcer describe a product (26) a model shows it. And they can shop around the clock, buying something (27) by making a phone call.
Department stores and even mail-order companies are (28) to join in the success of home shopping. Large department stores are busy (29) their own TV channels(频道)to encourage TV shopping in the future. Customers can ask questions about products an
A. exist 
B. practise 
C. follow 
D. appear

[单项选择]

Have you ever had to decide whether to go shopping or stay home and watch TV on a weekend Now you (21) do both at the same time. Home shopping television networks (网络)have become a (22) for many people to shop without (23) having to leave their home.
Some shoppers are (24) of department stores and supermarkets—fighting the crowds, waiting in long lines, and sometimes having slight (25) of finding anything they want to buy. They’d rather sit quietly at home in front of the TV set and watch a friendly announcer describe a product (26) a model shows it. And they can shop around the clock, buying something (27) by making a phone call.
Department stores and even mail-order companies are (28) to join in the success of home shopping. Large department stores are busy (29) their own TV channels(频道)to encourage TV shopping in the future. Customers can ask questions about products an
A. must 
B. should 
C. shall 
D. can

[单项选择]Have you ever felt your life go into slow motion as you realize something bad is happening You might have just knocked over a wine glass or noticed a car hurtling towards you, for example. Now scientists have measured exactly how much these attention-grabbing(引人注意的)events slow down our perception of the world around us.
Another example of the world appearing to slow down is when you are hanging on the phone waiting for someone to pick up at the other end. If your attention wanders while you’re waiting, then suddenly switches back,you will probably hear what seems like a longer than usual silence before hearing the dialling tone again. For you, time will have momentarily slowed.
To see how our perception of time changes when something new happens, Vincent Walsh and his colleagues put headphones on volunteers and played eight beeps to their right ears. The gap between each beep was exactly i second, except for the gap between the fourth and fifth beeps, which the scientists cou
A. have a high concentration of mind
B. feel very annoyed at the people on the other end
C. feel time is somehow slowed down
D. be unable to hear the dialing tone