肝脏的正中裂将肝分为左、右两部分，左、右之比约（） A.3：7 B.4：6 C.5：

激光波束制导系统主要由（）组成。

A、瞄准与跟踪

B、激光发射与编码

C、弹上接收与译码

D、角误差指令形成与控制

糖 对于 ( ) 相当于 汞 对于 ( )

A．菏 毒

B．核糖 非金属

C．咖啡 温度计

D．碳水化合物 水银

菱铁矿的主要成份是（）。

A．Fe₂O₃

B．Fe₃O₄

C．nFe₂O₃•mH₂O

D．FeCO₃

Why do airplanes take longer to fly west than east

It can take five hours to go west-east from New York(NY) to London but seven hours to travel east-west from London to NY. The reason for the difference is an atmospheric phenomenon known as the jet(喷射) stream. The jet stream is a very high altitude wind which always blows from the west to the east across the Atlantic. The planes moving at a constant air speed thus go faster in the west- east direction when they are moving with the wind than in the opposite direction.

2. What would happen if the gravity on Earth was suddenly turned off

Supposing we could magically turn off gravity. Would buildings and other structures (建筑物) float away What happened would depend on how ply the things were attached to the Earth, The Earth is moving at quite a speed, moving at over a thousand miles per hours. If you turn something around your head on a string(细绳) , it goes around in a circle until you let go of the string. Then it flies off in a straight line. ’ Switching off’ gravity would be like letting go of the string. Things not attached to the Earth would fly off in a straight line. People in buildings would suddenly shoot up-wards at a great speed until they hit the ceiling. Most things outside would fly off into space.

What information can we get from the first passage（）

A. It is the jet stream that affects how fast airplanes fly

B. Planes go slower when they are moving with the wind

C. It takes more time to fly from NY to London than from London to NY

D. The jet stream always blows from the east to the west across the Atlantic

所有者权益是指所有者在企业资产中享有的经济利益，下列内容中属于所有者权益的是（）。

A．长期应付款

B．预提费用

C．任意公积金

D．货币资金