如图所示，光滑的水平面上有一足够长的木板，在木板的右端固定着一个滑轮（不计绳与滑轮间的摩擦），木板上面放置一个小木块，小木块一端连接着弹簧测力计。当拉力F为4牛时，木板向右做匀速直线运动，然后把拉力增大到6牛时，下列分析正确的是（  ）

2.3+5.6=____       $\frac{1}{6}\text{+}\frac{2}{3}\text{=}$ ____      $98÷4\text{=}$ ____

$7.8\text{+}0.9\text{-}1.4\text{=}$   ____      $1.2\times 1.3÷2\text{=}$ ____

$28\text{-}13\times 2\text{=}$  ____     $\frac{3}{4}\text{-}\frac{5}{12}\times \frac{6}{7}\text{=}$ ____

阅读理解,判断正误

      Most children like to watch cartoons on TV because of the funny characters and the bright colors. But is it good for children to watch cartoons on TV?

      Some people think it leaves nothing for children to imagine when they are watching cartoons on TV. They can see the different characters so they need not imagine the appearance of a character or any situation in the cartoon. But when reading a book, he has to imagine how the different characters look like.He has to imagine a place or a situation described in the story he is reading, so the imaginative power of the child improves.

       Very little children may not be able to read books. But they will be happy to watch TV, especially watch cartoons. Watching cartoons will improve their language ability. As most of the cartoons are in English, watching them will improve their English. They will learn to understand the conversations between others. Their vocabulary will get improved. They will learn how to pronounce different words. Their spoken English will also get greatly improved.These are the advantages(好处) of watching cartoons.

        But there should be a limit(限制) to everything. Parents should control their children's time on TV. However, you cannot keep children from watching TV completely. It will only do more harm than good.