不符合恶性骨肿瘤的X线表现（） A.病变边界模糊，不规则 B.病变形态常为弥漫性浸润

Playing is serious business for children. In fact, it’s what they do best! Ask them why they do it, and kids will probably say, “Because it’s fun!” But it’s much more than that. It’s also good for them.

Studies show that from birth babies begin learning through playing. They use their five senses to get to know their new world. Touching allows them to discover how different things feel. Brightly colored toys and clothing help develop a baby’s sense of sight.

When small children choose which toy to play with, they begin developing their abilities in making decisions. Children love toys that allow them to use their imagination. Sometimes an empty box is more fun than a high-tech toy. That’s because a box can become anything a child imagines it to be.

Crayons, paints and Ply-Doh(彩色塑泥)are also good because they allow children to create. Traditional building blocks teach important pre-math skills like problem-solving.

Playing doesn’t become any less important once children start school. __＊___. Kids learn how to share, take turns and play by the rules.

小题1:Why is playing a serious business for children?

A．Because it is fun.

B．Because children can get much more from playing.

C．Because children make friends through playing.

D．Because children like playing.小题2:What does touching help babies develop?

A．Touching helps babies to discover how different things feel.

B．Touching help develop babies’ sense of sight.

C．Touching helps develop babies’ imagination.

D．Touching helps develop babies’ pre-math skills.小题3:What can we fill in the＊ ?

A．Classroom is the most important place for children to learn life

B．Many useful lessons about life are learned on the school playground

C．No useful lessons about life are learned on the school playground

D．Children can’t play on the school playground any more小题4:What’s the best title for the passage?

A．Playing With Children

B．How to Become a Playboy

C．How to Play

D．Playing Plays an Important Role in Life

根据“探究杠杆平衡的条件”实验要求，完成下列各题：

（1）实验开始时，杠杆的位置如图1所示。小李同学想要通过调节杠杆右端的螺母，使杠杆在水平位置平衡，则调节时音使右端的螺母向____________移动（选填“左”或“右”）。

（2）实验时，如果采用图2的方法实验，当弹簧测力计由图甲所示竖直地拉变成图乙所示倾斜地拉，使杠杆在水平位置静止时：

（a）请在图2乙中画出拉力F'的力臂l' 。

（b）弹簧测力计的示数将__________（选填“变大”、“不变”或“变小”）。

                                         图1                                                                                          图2

梅毒黏膜斑是以下哪种梅毒的特征性表现（）

A.一期梅毒

B.二期梅毒

C.三期梅毒

D.先天梅毒

E.潜伏梅毒

概算指标形式较多，主要可( )进行计算。

A．按占设备价值百分比的概算指标

B．按每吨设备安装费的概算指标

C．按占设备安装价值的概算指标

D．按座、台、套、组、根或功率等为计量单位的概算指标

E．按设备安装工程每平方米建筑面积的概算指标

休克型中毒型细菌性痢疾的主要表现为（）

A.高热

B.脓血便

C.惊厥

D.循环衰竭

E.呼吸衰竭