当代医学科学研究和创新的“双刃剑”效应是指（）。

A.当代医学科学研究和创新带来了医学的进步

B.当代医学科学研究和创新带来了道德的退步

C.当代医学科学研究和创新促进了人类健康

D.当代医学科学研究和创新可能用于危害人类健康

E.当代医学科学研究和创新既有促进人类健康的价值又有用于危害人类健康的可能

(a) Aminah saw an advertisement in a newspaper, which referred to a ‘special offer while stocks last’ by a local supermarket of a well-known brand of vacuum cleaners. The offer price was stated to be RM100 per unit. The usual price of such vacuum cleaners was around RM300 per unit. Aminah rushed to the supermarket, chose one of the vacuum cleaners and took it to the payment counter. The salesperson at the counter told her that the supermarket had increased the price of the vacuum cleaner and that the new price was RM320. Aminah refused to buy the vacuum cleaner at that price. She seeks your advice whether the supermarket is contractually bound to sell the vacuum cleaner to her at the advertised price of RM100.Required:Advise Aminah. (5 marks)