一牢固组合体，在能见度不良水域中航行，应以不超过2分钟的间隔连续鸣放：（）.
A.两长声
B.一长声
C.一长两短声
D.一长三短声
参考答案：B
多数情况下，逆反心理导致与父母的冲突，其结果是[ ]
A．惩罚了自己
B．伤害了父母
C．惩罚了父母，自己高兴
D．惩罚了自己，父母高兴
根据句意，用括号内所给单词的适当形式填空。
小题1:Have you heard of the recent __________ (develop) in online education?
小题2:I believe our charity show will be _______ (success) held.
小题3:The environment is destroyed ________(serious) now.
小题4:Would you please help me find out the _______ (support) names on the list.
小题5:Some _______( operate) have been performed on the blind people.
