[单项选择]A. Buy a used bicycle. B. Buy a racing bicycle.
C. Replace the tires on his bicycle. D. Sell his old bicycle to the shop.

[单项选择]A. To buy a used bike.
B. To buy a racing bike.
C. To buy a touring bike.
D. To trade her old bike for a new one.

[填空题]M-Pesa can be used to buy products and services.

[单项选择]Old Chinese are not used to buy things on （　） and are likely to save as much money as possible.
A. deposit
B. debt
C. credit
D. sale

[单项选择]Old Chinese are not used to buy things on（）and are likely to save as much money as possible.
A. deposit
B. debt
C. credit
D. sale

[单项选择]A stop is used to trigger a buy or sell order when the stock price reaches a specified price:（）
A. but does not guarantee that the order is completed at the stop price. 
B. but is only triggered if the order can be completed at the stop price. 
C. but only after the seller receives written or verbal notification from the selling broker.

[单项选择]Questions 27-30A. Buy a used bicycle. B. Buy a racing bicycle.
C. Replace the tires on his bicycle. D. Sell his old bicycle to the shop.

[单项选择]
Scientists are racing to build the world’s first thinking robot. This is not science fiction: some say they will have made it by the year 2020. Carol Packer reports.
Machines that walk, speak and feel are no longer science fiction. Kismet is the name of an android (机器人) which scientists have built at the Massachusetts Institute of Technology (MIT). Kismet is different from the traditional robot because it can show human emotions. Its eyes, ears and lips move to show when it feels happy, sad or bored. Kismet is one of the first of a new generation of androids—robots that look like human beings—which can imitate human feelings. Cog, another android invented by the MIT, imitates the action of a mother. However, scientists admit that so far Cog has the mental ability of a two-year-old.
The optimists (乐观主义者) say that by the year 2020 we will have created humanoids (机器人) with brains similar to those of an adult human bein
A. it thinks for itself.
B. it is not like science fiction.
C. it can look after two-year-olds.
D. it seems to have human feelings.

[单项选择]Scientists around the world are racing to learn how to rapidly diagnose，treat and stop the spread of a new，deadly disease．SARS—Severe Acute Respiratory Syndrome—was (1) for the first time in February 2003 in Hanoi， (2) since then has infected more than 1，600 people in 15 countries，killing 63．At this (3) ，there are more questions than answers surrounding the disease．
Symptoms start (4) a fever over 100．4 degrees F，chills，headache or body (5) ．Within a week，the patient has a dry cough，which might (6) to shortness of breath．In 10% to 20% of cases，patients require (7) ventilation to breathe．About 3.5% die from the disease．Symptoms (8) begin in two to seven days，but some reports suggest it (9) take as long as 10 days．Scientists are close to (10) a lab test to diagnose SARS．In the meantime，it is diagnosed by its symptoms．There is no evidence (11) antibiotics or antiviral medicines help，<
A. so
B. but
C. still
D. yet