第7题: [单项选择]The desert is full of activities in summer nights because ______. A. it is cooler and safer for most animals at night B. animals can find food in the dark C. it is easy for animals to find water at night D. animals cannot sleep at night 参考答案:A 答案解析:由题干关键词activities和in summer nights定位到第一段最后五句话,倒数第三、四句 Only after the sun has set does the desert come
第34题: [单项选择]下列符号中能够作为C++标识符的是 A. const B. 2a C. -shape D. -count 参考答案:C 答案解析:作为标识符必须满足以下规则:所有标识符必须由一个字母(a~z,A~Z)或下划线“_”开头;标识符的其它部分可以用字母、下划线或数字(0~9)组成;大小写字母表示不同意义,即代表不同的标识符;标识符只有