A.is
B.of
C.the
D.have

A.that
B.effect
C.for
D.development

A.done
B.of
C.species
D.ecological

A.The more
B.we use
C.the more better
D.will become

A.do housewives have to
B.get it done
C.for
D.cleaners

A.instead of
B.electronics
C.tend to toss
D.In

A.protect
B.forbidding
C.to restrict
D.and creating

A.with
B.were
C.when
D.started

A.was
B.play
C.making
D.pictures

A.\(\mathop {\lim }\limits_{x \to  + \infty } \left( {\sqrt {3x + \sqrt {3x + \sqrt {3x} } }  - \sqrt {3x} } \right) = \dfrac{1}{2}\) \(\mathop {\lim }\limits_{x \to  - \infty } \left( {\sqrt {3x + \sqrt {3x + \sqrt {3x} } }  - \sqrt {3x} } \right)\) không tồn tại.
B.\(\mathop {\lim }\limits_{x \to  \pm \infty } \left( {\sqrt {3x + \sqrt {3x + \sqrt {3x} } }  - \sqrt {3x} } \right) = \dfrac{1}{2}\)
C.\(\mathop {\lim }\limits_{x \to  \pm \infty } \left( {\sqrt {3x + \sqrt {3x + \sqrt {3x} } }  - \sqrt {3x} } \right) = -\dfrac{1}{2}\)
D.\(\mathop {\lim }\limits_{x \to  \pm \infty } \left( {\sqrt {3x + \sqrt {3x + \sqrt {3x} } }  - \sqrt {3x} } \right)\) không tồn tại