A、 is broadcast
B、 is being broadcast
C、 has been broadcast
D、 had been broadcast
答案：B
A、 is broadcast
B、 is being broadcast
C、 has been broadcast
D、 had been broadcast
答案：B
A. what
B. which
C. why
D. when
A. you needn’ t
B. you won’ t
C. you can’t
D. you don’ t
A. called
B. armed
C. chosen
D. recognized
A. 不填;a
B. a; a
C. the; the
D. the;不填
A. need
B. time
C. aim
D. peace
A. disturbing
B. teaching
C. forcing
D. reminding
A. 类并不高于其他生命。
B. 线粒体和病毒都为生命活动提供能量。
C. 病毒也在不停地变异。
D. 地球上的生命具有同一性和多样性。
