the Stegosaurus dinosaur 单数，dinosaurs复数

C和D
Financial uncertainties resulting from 比 Financial uncertainties from 更加当，逻辑上financial uncertainties 是由于accident造成的而不是来源于accident。than political opposition 和 than is political opposition 都对。

m

Once ingested by a caterpillar, the crystals dissolve, releasing the virus to infect the insect's cells

Finally, national and regional economies are composed of individual firms and industries, and relying on general, sweeping economic indicators may mask substantial variations among these different enterprises

这24个数中千位、百位、十位、个位的和都是60
60*(10^3 + 10^2 + 10 + 1) = 66660

x可为12，15，18，20，24

2是唯一的偶质数

Prior to Kerber’s work, educational historians barely mentioned women and girls; Thomas Woody’s 1929 work is the notable exception.

. It may be that males can use scarce carotenoids either for immune defense and detoxification or for attracting females.

这题OG答案比较好

Males that are more susceptible to disease and parasites will have to use their carotenoids to boost their immune systems, whereas males that are genetically resistant will use fewer carotenoids for fighting disease and will advertise this by using the pigments for flashy display instead.

which can inappropriately shelter suppliers from rigorous competitive scrutiny that might afford the purchaser economic leverage.

e错The weakness of the hypothesis which sounds plausible 中which修饰的事weakness，跳过介词短语去修饰weakness

难点在于如何准确不漏地找到所有符合要求的数
从小到大枚举
0，1
10，11
1000，1001，1010，1011，1100，1101，1110，1111
和为8888 = 2*2*2*11*101

千位数是1
百位数是6
十位数是k
个位数是4

题目意思：
5个整数在【10，99】中，这五个整数必须从ten digits ( 0 1 2 3 4 5 6 7 8 9 )中取一次而组成的两位数，使得这5个整数之和越小越好。问最大可能组成的整数是多少？
5个整数在【10，99】中相当与限定了5个整数都是两位数的整数
可知5个整数的十位数从 (1 2 3 4 5)中取，个位数从 (0 6 7 8 9)，这种情况下5个整数和最小，和为180
故最大可能的数为59

ron: The incorrect use of the perfect tense in B is a deal breaker. This happened over 100 years ago!

n最大为3333，最小为3000
在【3000, 3333】中能够被3整除的数有3000，3003，3006，3009，……，3333
通项为3n + 2997
解得 n = 112

100a + 10b + c - (100c + 10b + a) = 99*(a - c) 要是7的倍数，那么 a - c 必须要是7的倍数
由于a, b, c 为非零
只能是
a = 9, c = 7
a = 8, c = 1
b为任意1到9
故 9 + 9 = 18