某男，13岁，恒牙，磨牙远中关系，双侧第二磨牙正锁，上颌略前突，下颌基本正常，上切牙至SN为105°，覆覆盖Ⅱ度，上下牙弓Ⅱ度拥挤，用方丝弓矫治器拔牙矫治

第二磨牙锁矫治的时机为

A:在矫治初期解除锁 B:在远中移动尖牙时 C:在关闭拔牙间隙时 D:在牙位精细调整时 E:16岁以后矫正

某男，13岁，恒牙，磨牙远中关系，双侧第二磨牙正锁，上颌略前突，下颌基本正常，上切牙至SN为105°，覆覆盖Ⅱ度，上下牙弓Ⅱ度拥挤，用方丝弓矫治器拔牙矫治

在矫治锁时临床上可以使用

A:单侧前磨牙垫 B:双侧前磨牙垫 C:单侧至第一磨牙的后牙垫 D:双侧至第一磨牙的后牙垫 E:前牙连冠斜导

某女，8岁，替牙，前牙关系为：上下恒切牙反，反覆

此患者的诊断及分类不正确的是

A:牙性错 B:功能性错 C:骨性错 D:安氏Ⅰ类，毛氏Ⅱ类3分类 E:垂直骨面型为适中型

某男，9岁，前牙反求治。侧面观凹面型，上颌后缩，下颌基本正常。口内检查：前牙反，双侧磨牙近中尖对尖，下颌不可退至对刃。反覆

该患者错畸形有关的可能性最大的病因是

A:乳牙反未治，上颌骨发育受限 B:咬下唇习惯 C:吐舌习惯 D:后牙萌出过度 E:垂体功能亢进

He invited the three of ______, Bob, Tom and ______.

A:we…me B:us…I C:we…I D:us…me

He came to the party, ______ he hadn't been invited.

A:in case B:in spite of C:even D:although

A Wishing to encourage her young son’s progress on the piano, a mother took her boy to a Paderewski concert. After they were seated, the mother spotted a friend in the audience and walked down the aisle to greet her. Seizing the opportunity to explore the wonders of the concert hall, the little boy rose and eventually explored his way through a door marked "NO ADMITTANCE. " When the house lights dimmed and the concert was about to begin, the mother returned to her seat and discovered that the child was missing. Suddenly, the curtains parted and spotlights focused on the impressive Steinway on stage. In horror, the mother saw her little boy sitting at the keyboard, innocently picking out Twinkle, Twinkle Little Star. At that moment, the great piano master made his entrance, quickly moved to the piano, and whispered in the boy’s ear," Don’t quit. Keep playing. "Then leaning over, Paderewski reached down with his left hand and began filling in a bass part. Soon his right arm reached around to the other side of the child and he added a running obbligato. Together, the old master and the young beginner transformed a frightening situation into a wonderfully creative experience. The audience was amazed and cheered up. That’s the way it is in life. What we can accomplish on our own is hardly noteworthy. We try our best, but the results aren’t exactly graceful flowing music. But when we trust in the hands of a Greater Power, our life’s work truly can be beautiful. Next time you set out to accomplish great feats, listen carefully. You can hear the voice of the Master, whispering in your ear," Don’t quit, keep playing. "The reason why the boy went to the piano was that ______.

A:he was encouraged to explore B:his mother forced him to have a look C:he was invited to by the master D:he was curious about the surroundings

A Wishing to encourage her young son’s progress on the piano, a mother took her boy to a Paderewski concert. After they were seated, the mother spotted a friend in the audience and walked down the aisle to greet her. Seizing the opportunity to explore the wonders of the concert hall, the little boy rose and eventually explored his way through a door marked "NO ADMITTANCE. " When the house lights dimmed and the concert was about to begin, the mother returned to her seat and discovered that the child was missing. Suddenly, the curtains parted and spotlights focused on the impressive Steinway on stage. In horror, the mother saw her little boy sitting at the keyboard, innocently picking out Twinkle, Twinkle Little Star. At that moment, the great piano master made his entrance, quickly moved to the piano, and whispered in the boy’s ear," Don’t quit. Keep playing. "Then leaning over, Paderewski reached down with his left hand and began filling in a bass part. Soon his right arm reached around to the other side of the child and he added a running obbligato. Together, the old master and the young beginner transformed a frightening situation into a wonderfully creative experience. The audience was amazed and cheered up. That’s the way it is in life. What we can accomplish on our own is hardly noteworthy. We try our best, but the results aren’t exactly graceful flowing music. But when we trust in the hands of a Greater Power, our life’s work truly can be beautiful. Next time you set out to accomplish great feats, listen carefully. You can hear the voice of the Master, whispering in your ear," Don’t quit, keep playing. "The reason why the boy went to the piano was that ______.

A:he was encouraged to explore B:his mother forced him to have a look C:he was invited to by the master D:he was curious about the surroundings