非系统性风险只对特定的个别股票产生影响，它是由微观因素决定的，与整个市场无关，可以通过投资组合进行分散，故又称可控风险。( )
参考答案：对
根据短文内容及首字母提示，填写所缺单词。
Nylon (尼龙) 1. w______ invented in the early 1930s 2. b______ an American chemist, Julian Hill.
Nylon was introduced to the world. It was cheap and strong and immediately 3. b________ successful,
especially in the making of women's stockings.
During the Second World War (战争), the best present for many women was a pair of nylon
stockings, but more importantly, nylon was 4. u______ to make parachutes (降落伞) and tyres.
Today, nylon is found in many things: carpets, ropes, seatbelts, computer, furniture and so on.
It has 5. p______ an important role in our lives for over 50 years.
1.______ 2._____ 3.______ 4.______ 5.______
下列不属于基因治疗策略的是（）。
A.基因置换
B.基因修正
C.基因修饰
D.基因失活
E.基因克隆
