“近朱者赤，近墨者黑”这句成语告诉我们交朋友时[ ]
A．不要与有缺点的人交朋友
B．要少而精
C．朋友越多越好
D．一定要谨慎
答案：D
To succeed in a scientific experiment _____ .
A．carefulness is need
B．carefulness is one needs
C．one needs to be careful
D．one need being careful
下列可破坏细菌细胞膜，使细菌溶解死亡的是
A．青霉素
B．溶菌酶
C．防御素
D．血浆凝固酶
E．SPA
