含油气圈闭的形成应具备（），（）和盖层的组合.

航空主运单的发货人栏和收货人栏列明的是真正的托运人和收货人。

Americans love sports . But this hobby sometimes has serious results—at least to the players. For example, when people play tennis, sometimes they hurt their elbow（肘部）. Also it is easy to hurt a knee in a football game. These injuries（毁伤）happen while the player is having fun, but they still hurt.

A few months ago, Kathleen Simmons, who loves playing volleyball, hurt her knee in a volleyball game. Her doctor told her that she needed a very difficult operation（手术）or she might not be able to play again. She felt very sad

Then Simmons learned about “video operation”. With the help of this new science in medicine, doctors can now repair many injuries.

For this operation, her doctor didn’t have to open her knee. Instead he put a very small camera lens（镜头）inside her knee. The lens sent back pictures, which appeared on a television screen. As he worked, he could see the inside of her knee on the TV. With the help of the large pictures on the screen, the doctor knew exactly what to do when he was making the repairs.

Simmons started walking five days after her operation. “My knee hurt a lot the first few days,” she said. “But I felt better very quickly.” Now, six months after her operation, Simmons can do everything she did before her injury. “It feels like a new knee,” she said. “I can even play volleyball again.”

小题1:Do Americans love sports?

小题2:What sport is Simmons interested in?

小题3:What did the doctor put inside Simmons’ knee?

小题4:What problem may people have when they play sports?

小题5:Can Simmons do everything like before?

可摘局部义齿基托与天然牙关系的（）。

A．基托应进入基牙邻面倒凹区

B．前部基托边缘不应位于舌隆突上

C．基托应与牙面密合，有一定的压力

D．基托近龈缘处要做缓冲

E．以上均不正确

在光谱分析中，仪器测得As的比强度值为0.106。求As的含量为多少？已知As的工作曲线方程为C=0.03154I2+0.34426I-0.01029，As的漂移校正系数α=1.3179，β=0.00316。（取两位有效数字）

定金合同从下列哪项所述之日起生效？

A．合同当事人意思表示一致即生效

B．合同登记之日起生效

C．书面合同最后签字一方签字盖章之日生效

D．从实际交付之日起生效