最为可行的手术方案是A．钻孔术 B．窦道切除术 C．蝶形手术 D．截肢术 E．病骨段

_____, experts point out that students can easily fail at starting their business because of a lack of preparations.

A．But

B．However

C．while

D．though

企业的利得和损失应直接计人当期损益。( )

Skinner Creek ESL Guest Ranch offers a unique outdoor adventure camp for inter national students．

Students who come to Skinner Creek have the opportunity to learn English in an environment entirely different from a regular school setting．English classes are designed to meet the academic and spoken levels of each student．All English classes will be taught by instructors qualified in Teaching English as a Second Language．All levels of English are available．

After class，students can enjoy many outdoor activities in a controlled．safe environment．Experienced supervisors（管理人）and camp teachers will prepare each activity to the level appropriate for each student．

Students’safety is a priority（优先考虑的事）for the staff of Skinner Creek ESI．Guest Ranch．Students are monitored at all times and supervisors are in the cabins with the students at night．Staff members have St．John’s First Aid and Transportation and Wilderness First Aid．An emergency clinic is nearby and accessible 24 hours．

English Classes：

Class hours are from Monday to Friday，9：00 am—2：00 pm．with a one—hour break for lunch．

Students are challenged in reading，writing，grammar，vocabulary building and conversational English．

Vocabulary is specific to related outdoor activities in some classes．

Fun after-class outdoor and evening activities

Great after—class activities on site include：horseback riding lessons．Hiking，baseball，volleyball，badminton，mountain hiking，bonfires（篝火）and much more．

Time to watch videos and TV and play games．

Experience Canadian family life．

Weekends：

Special all—day and overnight weekend activities include：camping，days at the lake（fishing，swimming，boating），cowboy church and more．

Travel Information：

Students will be picked up at Vancouver airport and dropped off again for their individual flights．Transportation to and from the ranch will be provided as well as overnight stays in Vancouver．

Please contact the ranch directly for prices：skinnercreek@telus．net

59．If you attend Skinner Creek Summer Camp，you will        ．

A．sometimes have English classes outdoors

B．learn how to deal with dangers in the wild

C．enjoy different sports activities after class

D．experience the traditional farmer 1ifestyle

60．How many hours of English classes do students have every week in Skinner Creek?

A．35 hours．         B．28 hours．          C．25 hours．              D．20 hours

61．Skinner Creek ESL Guest Ranch is in        ．

A．Canada        B．America                 C．England                 D．Australia

62．How will most students travel to Skinner Creek if they want to attend the camp?

A．By air．      B．By car．                 C．By boat．               D．By train．

噪声的特异性危害是指

A．对免疫系统危害
B．对听觉系统危害
C．对消化系统
D．对神经系统危害
E．对心血管系统危害

间接法ELISA中，形成的免疫复合物是

A．固相抗原-抗体-酶标二抗
B．固相抗体-抗原-酶标抗体
C．固相二抗-IgM-抗原-酶标抗体
D．固相抗体-酶标抗原
E．固相抗原-抗体-酶标抗原