新西兰的几维鸟是曾与恐龙生活在同一时代的古老鸟类，它（）
A、有翅无尾
B、有尾无翅
C、无尾无翅
D、有尾有翅
参考答案：C
原子的最外层电子数最多不超过（）
A.2个
B.4个
C.6个
D.8个
E.10个
By looking at a problem in as many ways as possible, creative thinkers can findsolutions
that would _____ remain invisible(看不见的).[ ]
A. otherwise
B. yet
C. already
D. forever
