A.@public
B.@protected
C.@private
D.@optional

A.A
B.B
C.C
D.D

A.one
B.two
C.three
D.崩溃信息

A.奥迪A6
B.保龄球
C.世界冠军杨威
D.西红柿

A.@end
B.@interface
C.@implementation
D.@property

A.#include ""
B.#include<>
C.#import ""
D.#import<>

A.封装
B.继承
C.多态
D.构造

A..cpp
B..m
C..pl
D..c

A、NSLog(@"%s",This isa Objective-C program.);
B、NSLog(@"%@",This isa Objective-C program.);
C、NSLog(@"This is aObjective-C program.",%@);
D、NSLog(@"This is a Objective-Cprogram.");

A.@import
B.@interface
C.@implementation
D.@protocol

A.1/0
B.YES/NO正
C.true/false
D.1/-1