如口对口人工呼吸难以进行,可改为口对鼻人工呼吸。
A. 对
B. 错
The system needs to be______ operation for six months before it can be assessed.
A. on
B. in
C. for
D. under
Do youknowhow muchyouspendonclothesandgroceries______?
A. annul
B. annual
C. annually
D. annuity
_______English is quite different from written English.
A. Spoken
B. Speak
C. Spoke
D. Speaking