问答题

One result that information technology has brought about for the transportation industry is______.
A．an integrated, international network of information
B．enhancements in safety and security
C．a significant increase in efficiency
D．increased government regulation

A.
A．an
B.enhancements
C.a
D.increased

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单项选择题

Except for ____ a healthy diet, we also need to keep on excercising so that we can lose weight.

A.having
B.have
C.had
D.eat

What caused the differences in the density of matter to grow larger?
A．Gravitational attraction.
B．Little differences in the density of matter.
C．The big bang.
D．Massive stars.

A.Gravitational
B.
B．Little
C.
C．The
D.
D．Massive
E.