伪劣墙地砖的特点有（）。
A.产品标记不全
B.产品规格尺寸分差大
C.理化性能指标不合格
D.外观有缺陷
参考答案：A, B, C, D
The biggest problem for most plants, which ______ just get up and run away when threatened, is that animals like to eat them.
A．shan’t
B．can’t
C．needn’t
D．mustn’t
今利用高程为418.302米的水准点测设设计标高418.000米的点，设后视读数为1.302，则前视读数应为（）。
A．1.302米
B．0.302米
C．0.604米
D．1.604米
The biggest problem for most plants, which ______ just get up and run away when threatened, is that animals like to eat them.