Jacks is the name of a game that is quite popular with children. To play jacks you will need a small rubber ball and ten small metal objects（物体）called jacks.
The rules（规则）for this game are not complicated（复杂）. To begin, you put the ten jacks on the floor or ground in front of you. Throw the ball up but not too high, pick up one jack, and then catch the ball. Keep the jack in your hand and then go on picking up the other jacks one at a time. You lose your turn if you do not catch the ball, you do not pick up a jack or you drop any jacks from your hand.
When you finish all ten jacks, you now try to do the same thing again but with two jacks at one time. This is more difficult, of course. You lose your turn if you make any of the other three mistakes or if you do not pick up exactly（准确地）two jacks each time!
47、The jacks are made of .
A．paper B．rubber C．metal D．glass
48、A player picked up all ten jacks one at a time. Then he followed the rules and finished the second part. The total number（总数）of times that he picked up jacks is .
A．ten B．fifteen C．twenty D．twenty-five
49、After you pick up the first ten jacks, the game becomes more difficult because you may make one of .
A．two mistakes B．three mistakes
C．four mistakes D．ten mistakes
50、A good title for this passage is .
A．An Easy Game B．Throwing A Ball
C．Two Jacks D．A Ball And Ten Jacks
答案CBCA
47。48 为什么选 B 。C 不懂
请指教点播 谢谢

抓子游戏，我们小时候经常玩，估计现在的小孩子都不会了。

如果你理解规则的话，你明白怎么做了，规则是这样的。

一个像皮球放手中，十个金属球在地上，

第一部分的时候，扔起橡皮球，一次捡起一个金属球，然后接住橡皮球。因此，完成第一轮，需要捡十次。

第二部分，每一次扔起橡皮球，都要捡起两个金属球，而一共是十个金属球，所以需要五次。

因此前两部分完成了，你需要捡10+5，15次。选择B

49题的关键在于这两句话
You lose your turn if you do not catch the ball, you do not pick up a jack or you drop any jacks from your hand. 如果你犯了这三个错误：“没接到球，没捡起金属球，手中金属球掉落”，你就输了

You lose your turn if you make any of the other three mistakes or if you do not pick up exactly（准确地）two jacks each time! （完成第二部分时）如果你犯了以上任何三个错误，或者你犯了另一个错误----你没有一次捡起两个球，你就输了。

因此，当你捡起十个球时，你进入下一轮，有四种错误可以导致你的失败。选择C。