a是自然数可知a包括0，又因为0没有倒数，所以题干a是自然数，它的倒数一定是1a不正确．
故答案为：不正确．
He was worried, because he lost his bag ____ his passport, ID card and a lot of money. [ ]
A. included
B. including
C. contained
D. containing
铅对血红素合成的影响是由于铅主要抑制（）。
A、δˉ氨基乙酰丙酸脱水酶和血红素合成酶
B、δˉ氨基乙酰丙酸合成酶
C、粪卟啉原氧化酶
D、粪卟啉原脱羧酶
E、以上都不是
