答案：　D

　　4．解析：　推理判断题。根据倒数第三段和最后一段可知，Christakis认为，教育类的电视节目对孩子行为的影响是显而易见的。

　　答案：　C

　　5．解析：　细节理解题。根据最后一段第二句“Researchers agreed parents should be mindful of what exactly their young kids are watching on TV as well.”可知，家长应该关注孩子所看电视节目的内容。

　　答案：　D阅读理解阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。millions of years. But volcanic rock samples taken from the canyon now suggest that the canyon was down-cut instead.

　　Down-cutting is when a flood of water rushes over a landscape (地形) with enough force to cut deeply into the ground and leaves behind a canyon. Such a flood is usually released when a natural or man-made dam (堤坝) bursts.

　　Robert Webb, a research geologist, says natural dams seem to have formed and broken across the Colorado River several times during the last million years. The dams were built when lava(熔岩) from the eruptions of nearby volcanoes flowed into the river. The lava hardened into hard rocks and blocked the river, causing it to back up and form a lake. Each time the lake grew so huge that it broke the rock dam, releasing a flash flood that furthered the down-cutting process and deepened the canyon.

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