正常成人胸廓前后径与左右径之比为()
A.1:0.5
B.1:1
C.1:1.5
D.1:2
E.1:2.5
参考答案:C
人类每时每刻都离不开空气,在空气中体积分数约占21%的气体是
A.氮气
B.氧气
C.二氧化碳
D.稀有气体
He was sentenced to death ______ what he has stolen from the bank.
A.that
B.since
C.because
D.because of