不传播疾病,仅寄生人体致病的医学节肢动物是:
A. 硬蜱
B. 软蜱
C. 虱
D. 蚤
E. 疥螨
节肢动物的生物性防治是指:
A. 利用杀虫剂消灭节肢动物
B. 利用声、光、电等诱杀节肢动物
C. 利用天敌捕食节肢动物
D. 利用遗传方法防制节肢动物
E. 通过环境改造防制节肢动物
Part Three （para 13-21）Einstein’s discoveries were attributable to _________________.
A. His imagination and questioning.
B. His disregard for authority.
C. His powers of concentration.
D. His interest in science.
Part One (para 1-3)A young husband and father, Albert Einstein had to work hard to _____________.
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