有时为了医治一些危重病人，医院允许使用海洛因作为止痛药。其实，这样做是应当禁止的。因为，毒品贩子会通过这种渠道获取海洛因，对社会造成严重危害。
以下哪项如果为真，最能削弱上述论证( )
A．有些止痛药可以起到和海洛因一样的止痛效果。
B．贩毒是严重犯罪的行为，已经受到法律的严惩。
C．用于止痛的海洛因在数量上与用作非法交易的比起来是微不足道的。
D．海洛因如果用量过大就会致死。
E．在治疗过程中，海洛因的使用不会使病人上瘾。
参考答案：C
解析： 该项意味着，即使毒品贩子试图通过这种渠道获得海洛因，也不会对社会造成严重危害。所以，医院的做法还是不应当被禁止的。
| 任务型读写。 阅读下面短文，根据所读内容在表格中的空白处填入恰当的单词。 注意：每个空格只填一个单词。 | ||||||||||||
| From the beginning of human history, people have used oils from seeds and nuts. Most of the time these oils are used as food, especially in cooking. But sometimes they have other uses. For example, oils are used in paint and in cleaning products like soap. Oil is separated from seeds by using pressure. A machine called a press is often used. The first step in pressing the oil from seeds is to crush the seeds between two stones. The crushed seeds are then put into a cloth bag and the bag is hung up. Some of the oil will flow out of the bag and can be collected. But some oil will remain in the crushed seeds inside the bag. The easiest way to get the rest of the oil out is to place heavy rocks on the crushed material. Another method is to place several cloth bags on top of each other in a box. Then a long wooden stick is used to slowly push a heavy cover down on the bags. Great pressure is produced in this way. Much greater pressure can be produced by using a machine, a hydraulic jack (液压千斤顶). The greater the pressure, the more oil win be produced. Small presses are important in areas where electricity or gasoline cannot be used. They are also a good way to test if a local market for oil exists. Small batch presses can be made of local materials. Their cost is low. They are not difficult to operate. And they are easy to repair. The small presses produce good quality oil. But the work is hard. And getting all the oil from the seeds can be difficult. If there is a large supply of seeds, then hand-operated presses may not be enough to support a business. Large, powered presses that can operate all day are needed. | ||||||||||||
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