[单项选择]以下关于私有和保护成员的叙述中，不正确的是
A. 私有成员不能被外界引用，保护成员可以
B. 私有成员不能被派生类引用，保护成员在公有继承下可以
C. 私有成员不能被派生类引用，保护成员在保护继承下可以
D. 私有成员不能被派生类引用，保护成员在私有继承下可以

六、阅读以下文字，回答下面5个小题。
　　阿托生是美国运用最广泛的一种除草剂，除草效果明显，然而让它混入饮用水后，其危害极大。除完草之后残留在土壤中的阿托生会和土壤融为一体，并不会再流走。残留的阿托生会进入地下水源，造成更为广泛的危险。从动物实验可以看出，量多的阿托生损害肝、肾、肺或心脏，它还可能是一种致癌物质。美国印第安纳州珀杜大学的科学家找到了一种能吃掉阿托生的微生物。他认为该微生物虽不能用于净化被阿托生污染的水源，但可以在阿托生混入水源之前在土壤中使其转化为无害物质。实验室试验相当成功，该微生物可以在150天内消86%的阿托生。

Passage Four
People are used to speaking their native language, so immigrants are having many problem between the first generation and the second generation because they don’t have the same native language. Also, the second generation is losing their identity. Especially in America, there are many immigrants that came from different countries to succeed in the States. Because they suffer in lots of areas such as getting a job and trying to speak English, they want their children to speak English, not only at school, but also at home in order to be more successful. Because of this situation, their children are losing their ethnic identity.
For example, my aunt, who has been living in Chicago for twenty-five years, has three children and they were all born in the States. The eighteen-year old daughter speaks English as a native language and she speaks Korean very well too. She has no problems talking with her parents, but she still doesn’t understand Kor
A. Learning a second language.
B. Immigrants who become sick in the U. S..
C. Schools attended by immigrants to the U. S..
D. Language and its effect on the identity of immigrants.