Pure oxygen is provided for ______ .
A. research workers in high mountains
B. children
C. patients
D. both A and C
查看答案
______ cannot live without oxygen.
A. Plants
B. Animals
C. Human beings
D. A, B and C
By using credit, people can______.
A. pay regular and day-to-day expenses
B. avoid unnecessary payment
C. save money to cover future cost
D. pay an unexpected expense too big to be paid at the moment
So badly______in the car accident that he had to stay in hospital for a few months.
A. did he injure
B. injured he
C. was he injured
D. he was injured
Which of the following is NOT TRUE？
A. The higher it is, the thinner the air would be.
B. The higher it is, the less oxygen you will feel.
C. The higher you arrive, the more plentiful oxygen you will breathe.
D. The higher it is, the more difficult you will breathe.
微信支付 
支付宝支付