判断字符型变量x是否是大写字母的正确的表达式（）

A.‘a’<=c1<=’z’

B.(c1>=’A’)&&(c1<=’z’)

C.(‘a’>=c1)||(‘z’<=c1)

D.(c1>=’a’)&&(c1<=’z’)

A.‘a’<=c1<=’z’

B.(c1>=’A’)&&(c1<=’z’)

C.(‘a’>=c1)||(‘z’<=c1)

D.(c1>=’a’)&&(c1<=’z’)

A.‘A’<=ch<=‘Z’

B.(ch>=“A”)&&(ch<=“Z”)

C.(ch>=‘A’)&&(ch<=‘Z’)

D.(ch>=‘A’)AND(ch<=‘Z’)

A.('a'>=ch)||('z'<=ch)

B.'a'<=ch<='z'

C.(ch>=a)&&(ch<=z)

D.(ch>='a')&&(ch<='z')

A.('a'>=cl) || ('z'<=cl)

B.(cl>=a) && (cl<=z)

C.'a'<=cl<='z'

D.(cl>='a') && (cl<='z')

A.if(x == 2)

B.if(x % 2 == 0)

C.if(x % 2 = 0)

D.if(x/2 == 0)

A.a = b

B.a == b

C.a != b

D.a <> b

A.赋值表达式

B.逻辑表达式

C.算术表达式

D.字符表达式

A.z=(x+y)++

B.x+y=z

C.y=ch+x

D.y=z%x