空气压缩机必须有（）保护装置。A、压力表 B、电流表 C、电压表 D、安全阀

阅读理解。

     Now satellites are helping to forecast (预报) the weather. They are in space, and they can reach any

part of the world. The satellites take pictures of the atmosphere (大气), because this is where the weather

forms (形成). They send these pictures to the weather stations. So meteorologists (气象学家) can see the

weather of any part of the world. From the pictures, the scientists can often say how the weather will change. 　　

     Today, nearly five hundred weather stations in sixty countries receive satellite pictures.When they receive

new pictures, the meteorologists compare them with earlier ones. Perhaps they may find that the clouds have

changed during the last few hours. This may mean that the weather on the ground may soon change, too. In

their next weather forecast, the meteorologists can say this. 　　

     So the weather satellites are a great help to the meteorologists. Before satellites were invented, the

scientists could forecast the weather for about 24or 48 hours. Now they can make good forecasts for three

or five days. Soon, perhaps, they may be able to forecast the weather for a week or more ahead (提前).

1. Satellites travel ____. 　　[ ]

A. in space

B. above space

C. above the ground

D. in the atmosphere

2. Why do we use the weather satellites to take pictures of the atmosphere?Because ____. 　　[ ]

A. clouds form there

B. the weather forms there 　　

C. the weather satellites can do it easily

D. the pictures can forecast the weather

3. Meteorologists forecast the weather ____. 　　[ ]

A. without studying satellite pictures 　　

B. before they receive satellite pictures 　　

C. when they have received satellite pictures 　

D. after they have compared the new satellite pictures with the earlier ones

4. Maybe we'll soon be able to forecast the weather for _____. [ ]

A. one day

B. two days 　

C. five days

D. seven days or even longer

以下关于种子萌发的叙述，错误的是（　　）

A．植物是光合自养的生物，所以种子萌发需要光照

B．种子萌发需要空气以满足种子呼吸作用中所需要的二氧化碳

C．种子萌发需要足够的水分，所以应将种子完全浸入水中直至幼苗形成

D．种子萌发时，种子内的一系列物质变化都是在多种酶的催化下进行的，所以温度是种子萌发的必要条件之一

患者，女，58岁，绝经8年，腹胀伴消瘦1个月。体检全腹部膨隆。妇检：发现后穹隆触及结节，子宫附件触诊不满意。盆腔B超见大量腹腔积液。右附件区可及一12cm×10cm×8cm实性包块，边界不规则。

为确诊，进一步的检查手段为

A．放疗

B．腹腔穿刺细胞学检查，后再次妇检

C．立即剖腹探查

D．化疗

E．肝功能、甲胎蛋白检验

与动脉相比，静脉的特点是[ ]

A．管壁簿、弹性大、管腔小

B．管壁厚、弹性大、管腔小

C．管壁薄、弹性小、管腔大

D．管壁厚、弹性小、管腔大

在WORD的编辑状态打开了一个文档，对文档作了修改，进行“关闭”文档操作后()。

A．文档被关闭，并自动保存修改后的内容

B．文档不能关闭，并提示出错

C．文档被关闭，修改后的内容不能保存

D．弹出对话框，并询问是否保存对文档的修改