单项选择题

How dose it explain the causes of the increasing juvenile crimes.It says that（）

A.part of the reason is the influence of Internet violence
B.a healthy internet-surfing evvironment is needed
C.the operatinf companies don’t filter the sontent online

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单项选择题

Now children，turn to page（）and look at the （）picture in Lesson Two.

A.twentieth；one
B.twenty；one
C.twentieth；first
D.twenty；first

单项选择题

since the beginning of history ，people have hoped for （）travel.

A.mutualplanetary
B.interplanetary
C.crossplanetary
D.betweenplanetary