HIV不会通过的途径传播是：（）
A．输血
B．握手
C．母婴
D．共用注射器注射
E．性接触
参考答案：B
They were all so tired that they could ______. [ ]
A. do nothing but sleep
B. do anything but sleep
C. do nothing but to sleep
D. do anything but to sleep
It is obvious to the students ____ they should get well prepared for their future. [ ]
A. as
B. which
C. whether
D. that
