股票和债券在风险性上相比，特点是( )。A．股票风险较大，债券风险相对较小 B．债

在某个特殊环境中可以缺少的成分是 [ ]

A．生产者

B．消费者

C．分解者

D．非生物部分

读下面某地的等高线图，回答问题。

（1）填出图中字母所表示的地形名称： A__________    B __________     C__________    E__________

（2）在这幅图中，李庄位于周庄的__________方向。

（3）图中小河向__________方向流。

（4）如果需要修筑一座水库大坝，应在______处最合适。

几个素数的积一定是（　　）

A．偶数

B．合数

C．素数

D．无法确定

下列选项中，关于商品期货的说法，正确的有( )。

A．商品期货是以实物商品为标的物的期货合约

B．商品期货是最早的期货交易种类，成为了现代期货市场体系中重要的组成部分

C．金属和能源期货属于商品期货

D．标的商品必须能保存较长的时间而品质不变，因此活牲畜不能作为期货合约标的物

Passage oneLong bus rides are like television shows .They have a beginning ,a Middle and an end –with commercials thrown in every three or four minutes .The commercials are unavoidable .They happen whether you want them or not .Every couple of minutes a billboard glides by outside the bus window . “buy super clean toothpaste”. “Drink Good’n Wet Root Beer .””Fill up with Pacific Gas .”Only if you sleep ,which site equal to turning the television set off ,are you spared the unending cry of “You Need It ! Buy It Now !” The beginning of the ride is comfortable and somewhat exciting ,Even if you’ve traveled that way before .usually some things have changed-new houses ,new buildings ,sometimes even a new road .The bus driver has a style of driving and it’s fun to try to figure it out the first hour or so . If the driver is particularly reckless or daring ,the ride can be an thrilling as a suspense story .Will the driver pass the truck in time Will the driver move into the right or the left –hand lane After a while,of course,the excitement dies down .sleeping for a while helps pass the middle hours of the ride .Food always makes bus rides more interesting .But you’ve got to be careful of what kind of foodyou eat .Too much salty food can make you very thirsty between stops. The end of the ride is somewhat like the beginning .You know it will soon be over and there’s a kind of expectation and excitement in that .The seat ,of course ,has become harder as the hours have passed.By now you’ve sat with you legs crossed ,with your hands crossed behind your head .the end comes just at the right time . There are just no more ways to sit.

According to the passage ,what do the passengers usually see when they are on a longBus trip( )

A．Buses on the road

B． Films on television

C．Advertisements on the board

D． gas stations