“谈虎色变”属于哪类反射活动（)A．条件反射B．无条件反射C．第一信号系统的条件反射D．第二信号系统的

A.df = new DateFormat();

B.df = Date.getFormat();

C.df = date.getFormat();

D.df = DateFormat.getFormat();

E.df = DateFormat.getInstance();

A．

B．

C．

D．

E．

F．

A.int foo() { /* more code here */ }

B.void foo() { /* more code here */ }

C.public void foo() { /* more code here */ }

D.private void foo() { /* more code here */ }

E.protected void foo() { /* more code here */ }

A．Direction d = NORTH;

B．Nav.Direction d = NORTH;

C．Direction d = Direction.NORTH;

D．Nav.Direction d = Nav.Direction.NORTH;

A．Alpha a = x;

B．Foo f = (Delta)x;

C．Foo f = (Alpha)x;

D．Beta b = (Beta)(Alpha)x;

A.Point p = Line.getPoint();

B.Line.Point p = Line.getPoint();

C.Point p = (new Line()).getPoint();

D.Line.Point p = (new Line()).getPoint();

A.Set set = new TreeSet();

B.Set set = new HashSet();

C.Set set = new SortedSet();

D.List set = new SortedList();

E.Set set = new LinkedHashSet();

A.foreach（x）System.out.println（z）；

B.for（intz：x）System.out.println（z）；

C.while（x.hasNext（））System.out.println（x.next（））；

D.for（inti=0；i