第18题: [单项选择]How many positive whole numbers less than 81 are NOT equal squares of whole numbers A. 9 B. 70 C. 71 D. 72 E. 73 参考答案:D 答案解析:该题也就是问小于81的非完全平方数有多少个。小于81的完全平方数有1,4,9,16,25,36,49,64共8个.而小于81的正整数有80个,所以小于81的非完全平方数有80-8=72个。
第28题: [填空题]__________________(并不是全体成员都愿意在协议上签字). There was some disagreement among them. 参考答案:Not all the members were willing to sign the agreement/All the members were not willing to sign the agreement 答案解析:此句主要考核部分否定的用法:not+all the+名词复数。
第29题: [单项选择]属于真核细胞型的微生物是 A. 螺旋体 B. 放线菌 C. 真菌 D. 细菌 E. 立克次体 参考答案:C 答案解析:真核细胞型微生物的代表是真菌。螺旋体、放线菌、细菌和立克次体均属于原核细胞型微生物,故选项A、B、D及E均为错误的答案。