Paragraph 3 mainly discusses
A. why the children and their parents were interviewed.
B. when the children tom the handlebars through 90 degrees.
C. what causes the children, to topple over.
D. how serious injuries occur.
查看答案
【H4】
A. use
B. devote
C. spend
D. take
In which of the following ways the new handgrip works？
A. It call be commercialized.
B. It reduces the dangerous forces in bicycle accidents.
C. It adds a few dollars to the cost of a bike.
D. It changes the direction of the handlebars in all impact.
Which of the following kills the most people in the United States？
Accidents.
B. Heart disease.
Cancer.
D. Smoking.
【H3】
A. diet
B. meals
C. food
D. dinner
微信支付 
支付宝支付