下列哪项不是硝酸甘油的禁忌证A．变异型心绞痛 B．颅脑外伤 C．青光眼 D．严重低血

I ______ for Shanghai this Saturday, so I want to know when the earliest plane ______.

A．leave; takes off

B．am leaving; takes off

C．leave; is taking off

D．am leaving; is taking off

选择适当的词语填入括号中。

（1）母亲这样整日地（     ）着。（A. 劳累  B. 劳碌）

（2）母亲就靠那三十亩地独力（     ）一家人生活。（A. 支持  B. 支撑）

（3）母亲（     ）着我们，不允许我们染上一点。（A. 管束  B. 管教）

（4）母亲（     ）的三言两语的诉说以及我亲眼见到的许多不平事实，启发了我幼年（     ）反抗压迫追求光明的思想，使我决心寻找新的生活。（A. 沉重   时代  B. 沉痛   时期）

患者，男，25岁，工人。半小时前车祸后出现右大腿部剧烈疼痛、肿胀和右下肢肢体的异常扭曲，考虑是股骨干骨折。

股骨干后外侧有数根股深动脉分支，骨折时易断裂，造成严重出血，具体有几根（）。

A.2根

B.3根

C.4根

D.5根

E.6根

Many people are wondering if it is safe to talk on the phone while driving. There have been quite a few accidents while drivers were talking on the phone. Some research is being done to find out if driving while talking on the phone is dangerous.
When there is a car accident police officers will find out if any of the drivers were using a cell phone. They will write this information in a report. The information will be saved and later studied.
There have been some very bad car accidents caused by drivers being distracted by cell phones. Drivers sometimes forget to watch the road carefully when they are using their phones. Not paying attention to the road can be dangerous, even deadly.
It is important for drivers to focus on the road. They need to pay attention to what is going on around them. They might need to stop or swerve quickly.
People want to make sure that the roads are safe for everyone. Studies will be done using the information police officers collect at accidents. Maybe someday this information will lead to laws about driving and using cell phones.

Driving and talking on the phone at the same time could be______, research says.

A．difficult

B．dangerous

C．illegal

D．fun

抗体的免疫效应包括（）

A.免疫调理

B.中和作用

C.激活补体

D.抗体依赖细胞介导的细胞毒性作用

E.以上都是