下列属于蒽酮类的是A．大黄素 B．芦荟大黄素 C．茜草素 D．芦荟苷 E．羟基茜草素

短文改错

     At 7: 30 on the morning, we gathered at the school gate and set off on a large bus.An hour later,

we arrive at the Forest Park.Getting off, we started our journey at once.

     First, we climbed the green hills and on the way tried their luck to hunt for hidden treasure.Next,

we toured around the lake in the comfortable boat.The beautiful scenery was really a feast for the

eye.Then at noon time, we landed and settled at an open area, which we enjoyed a wonderful picnic.

After eating, we sang and danced happy and played some interesting games.The day passed quickly.

Finally it was time for us to return back.So at 3:00 pm, we cleaned the ground, made our way to the

parking lot, getting on the bus and left.

     It was really an exciting trip since we had long busy with our school work.

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国际期货市场的发展大致表现为( )。

A．交易品种有所减少

B．交易规模不断扩大

C．金融期货后来居上

D．期货期权方兴未艾

下列关于合伙企业成立时间的表述中，符合合伙企业法律制度规定的是( )。

A．合伙人提出设立申请之日为合伙企业的成立日期

B．合伙人足额缴纳出资之日为合伙企业的成立日期

C．合伙企业营业执照签发之日为合伙企业的成立日期

D．合伙企业办理税务登记之日为合伙企业的成立日期

颗粒剂的优点不包括（）

A.吸收较快、作用迅速

B.制备工艺适于工业生产，产品质量较稳定

C.剂量较小，携带、贮藏、运输较方便

D.可达到缓释的目的

E.具有良好的吸湿性，易吸水结块

在C++语言中每个类都有一个______指针，该指针指向正在调用成员函数的对象。