某人在车后用80N的力推车，使车子在平直公路上匀速行驶，突然发现公路前面出现情况

（）负荷开关的参数高，电寿命长，成本偏高。

A．产气式

B．压气式

C．六氟化硫

D．真空

计算桥梁墩台侧模强度时采用的荷载有（）。

A.新浇筑钢筋混凝土自重 

B.振捣混凝土时的荷载 

C.新浇筑混凝土对侧模的压力 

D.施工机具荷载 

E.倾倒混凝土时产生的水平冲击荷载 

前苏联自1957年发射第一颗人造卫星以来，人类先后向太空成功地发射了各种卫星、飞船探测器，并顺利地登上了月球。科学家们预计，在21世纪太空将会诞生形形色色的空间产业。
21世纪，太空将会成为人类的又一旅游胜地。不久前，日本清水公司与美国贝尔罗蒂公司的专家设计了一种宇宙宾馆。它将处在距离地球450公里的高度，形状犹如直径为140米的大型游艺场，房间大约可供100名旅游者住宿。为了使这些旅游者避免由于失重而产生的不愉快的感觉，宇宙宾馆每分钟将自转3圈，这样就可以让它产生像地球上那样的引力。
美国航天专家詹姆斯·亚伯拉汉森说，由于宇宙航行非常安全，参加旅游的人不一定要有运动员那样的体魄，只要经过一般的体格检查，合格就可以了，人们完全可以期待有朝一日像出差到外地一样收拾起简单的行装，穿上宇宙服，搭乘航天飞机到太空去遨游。
美国航天总署为了配合星际探测计划，与波音公司合作研制一种名为“太空花园”的试验性太空舱。这种类型的太空舱，实际上是一个控制生态的“生命维持系统”。在这个系统中，将种植诸如橙、棉花和粮食等植物，为太空人提供食物、饮用水，回收他们排出的二氧化碳及粪便。

专家设计的宇宙宾馆的样子将是：

A．有一个太空花园
B．每分钟转3圈
C．可住100名顾客
D．像一个大型游艺场

Did you know that a turtle（乌龟）can lay 12 eggs in one minute? A large sea turtle lays

around 150 eggs at a time. She lays all these eggs in just a few minutes.

Large sea turtles live in the warm seas of the world. Except for when they lay their eggs,

they spend their whole lives in the water. When it is time to lay their eggs, the females swim toland. They usually return to the place where they themselves were born. How they find theirway back there is unknown.When they reach shore, the big, heavy turtles crawl slowly up to the high water mark.Using their flippers, they pull themselves along the sand. They must struggle like mountainclimbers. When they finally reach dry sand, they rest before beginning the difficult task oflaying eggs.The turtles lay the eggs in deep holes and cover them with warm sand. The sand protectsthe eggs from harm. Then the females leave them. After a few weeks, if you happened to be walking along the beach, you might see the sand begin to shake. You may see tiny black ballscoming out of the sand. The tiny heads of baby turtles!

小题1:

Which sentence expresses the main idea?

A．Sea turtles have interesting life habits.

B．Sea turtles swim to shore to lay their eggs.

C．Large sea turtles lay their eggs in special ways.

D．Sea turtles enjoy staying in the sand.小题2: Turtles bury their eggs to protect them from ____________.

A．deep water

B．danger

C．heat

D．bad weather小题3:We can conclude from this passage that ___________.

A．many turtles die while swimming to shore

B．female turtles protect their babies

C．once turtles land, they never return to the sea

D．the job of laying eggs takes great strength小题4: The writer compares turtles to climbers ___________.

A．because they lay their eggs in mountain areas

B．to give you a picture of how hard they work

C．to tell you that they like to climb

D．to show that mountain climbers are as slow as turtles

浸泡消毒法一般适用于水果的消毒。