下列反应不属于氧化还原反应的是( ) A.
Cl2 + H2O = HCl + HClO B.
Fe + CuSO4 = FeSO4 + Cu C.
2NaHCO 3 Na2CO3 + H2O + CO2 D.
Cl2 + 2FeCl2 = 3FeCl3

多项选择题Researchers may use many resources for the background information in their papers. These may include _________, etc. The purpose of the reference section is to list all of these so that the readers can have access to them. In addition, giving a reference list adds to the validity of the research. A、books B、periodicals C、works of literature D、reference works E、public documents F、electronic sources

单项选择题Making friends is extremely important to teenagers, and many shy students need the admission of some kind of organization with a supportive adult _____ visible in the background.