质重的饮片应放的药斗位置是（） A.上层中间 B.下层右侧 C.中层左侧

Film has a much shorter history, especially when __________ such art forms as music and painting.

A．having compared to

B．comparing with

C．compare with

D．compared with

在括号里填入恰当的量词。

一（　　）掌声　　一（　　）同学　　一（　　）实验

一（　　）小学　　一（　　）绳子　　一（　　）铁锤

一（　　）水井　　一（　　）大树　　一（　　）礼物

在（）业务中，交易双方都是金融机构。

A.票据发行便利

B.票据贴现

C.票据转贴现

D.票据承兑

My friend Max started to play football ______ he was seven years old.

A．since

B．when

C．if

D．while

无公害农产品标志规格分为（）种规格。

A、4

B、5

C、6

D、7