甲有一套房屋，将该房屋抵押给乙并办理了抵押登记。不久之后，甲

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问题单项选择题

甲有一套房屋，将该房屋抵押给乙并办理了抵押登记。不久之后，甲又将房屋抵押给丙，未办理登记。后来，甲将房屋卖给丁，丙办理过户登记。则下列说法正确的是( )

A．甲丙之间抵押合同未生效

B．乙不得行使抵押权

C．不经乙的同意，甲可以将房屋卖给丁

D．丙不得行使抵押权

答案

参考答案：D

解析：[考点] 抵押权
抵押权自登记之日起生效，未办理登记，抵押权未生效，但不影响抵押合同的生效。因此A、C错误D正确。根据《物权法》第191条第2款规定，抵押期间，抵押人未经抵押权人同意，不得转让抵押财产，但受让人代为清偿债务消灭抵押权的除外。因此C错误。

选择题

某种气态烃气体0.1mol，完全燃烧得0.2mol CO₂和3.6g H₂O，下列关于该气体的说法正确的是（　　）

A．乙烯

B．丙烯

C．甲烷

D．乙烷

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阅读理解

阅读理解.

     We are going to describe one way to build a rooftop garden that does not even require
soil. Four things are needed for a small rooftop garden. One thing is a roof that can support
the weight. Another is grass cutting. The third thing is a sheet of plastic in which to spread
the cut grass. And the last thing is a box about eight centimeters deep and made out of four
pieces of wood.
     Once you are sure the roof is good, cut and collect some grass. Then lay down the
plastic where the garden box will go. The four-sided box can be as long and as wide as
needed. Place the box on top of the sheet of plastic. Then fill it with the cut grass. Next,
add water and walk on the cuttings to press them down.
     After about three weeks, the rooftop garden is ready for planting. Put the seeds directly
into the wet grass cuttings. This garden is a good place to grow peas, tomatoes, beans, onions
and lettuce. If the box is deep enough, potatoes and carrots will also grow.
     It is important to keep the grass wet until the plants begin to grow. When the plants are
growing, they will need watering every day, unless there is rain. And they will need some liquid
fertilizer. Also, seeds and new plants must be protected from insects and birds. Rooftop
gardens are increasingly popular, and not just to grow vegetables. They keep buildings cooler
in the sun, so they save energy. They can also extend the useful life of a roof.
     Rooftop gardens also reduce the runoff of storm water and help clean the air. Plus the
add beauty, and give birds and insects in the city a nice place to live.

The building of a rooftop vegetable garden

Things needed	1._______	Requirements
a roof	to 2._____ the weight	3. _____and strong enough
grass cutting	to be used as 4.____	to be pressed down
a sheet of plastic	to 5._____possible leaks(渗漏)	on which to 6._____ the cut grass
a 7._____ box	to hold the cut grass	made of 4 pieces of wood
seeds	for vegetables	to be protected from 8._______
9.____ and fertilizer	to make vegetables grow better	supplied frequently and 10.______ fertilizer

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