以下涉及物理学史上的重大发现，其中说法正确的是（   ）

A．卢瑟福发现了电子，说明原子可以再分

B．居里夫妇发现了天然放射性现象，说明原子有复杂的结构

C．汤姆生在原子核人工转变的实验中，发现了质子

D．查德威克在原子核人工转变的实验中，发现了中子

The community health nurse develops a health education program about preventing the transmission of hepatitis B. The nurse evaluates that the teaching has been effective when the community residents identify which of the following activities to be high risk for acquiring hepatitis B()

A. Sharing needles for drug use.

B. Ingestion of contaminated seafood.

C. Frequent use of marijuana.

D. Ingestion of large amounts of acetaminophen (Tylenol).