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【单选题】
被称作“抗脚气病因子”的维生素是 ( )A.
维生素A
B.
维生素B 1
C.
维生素C
D.
维生素D
E.
维生素B 2
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【单选题】Why does the man like doing extreme sports?
A.
He is not afraid of getting hurt.
B.
Extreme sports are competitive sports.
C.
He thinks extreme sports are interesting
D.
He thinks his life is boring.
【单选题】How can people reduce the level of danger when doing extreme sports?
A.
Reduce the times of doing extreme sports.
B.
Wear safety equipment.
C.
Do extreme sports with other people.
【单选题】Some extreme sports ______.
A.
cost a lot of money,
B.
belong in the category of popular sports.
C.
waste your time.
D.
are forbidden.
【简答题】系统设计的五个指标是可靠性、工作质量、________、工作效率和经济性。
【多选题】Extreme sports are also called ( ).
A.
action sports
B.
active sports
C.
adventure sports
D.
air sports
【简答题】Sure，you’ve watched extreme pet sports on Animal Planet. But did you know that there’s a whole world of athletic activities for dogs right in our area? There are some reasons for considering taking pa...
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