unit1 a land of diversity 单项选择题 1.《原创》tom wants to catch up with others. that is he is always getting up early a because b why c when d how 《解析》that is why….. 那就是为什么….的原因。that is because….那是因为…。《答案》b 《教材例句》that is why today over 40% of californians speak spanish as a first or second language. 2. 《原创》it that the human being’s activities are the major reason why pollution is becoming more and more serious. a is believing b to believe c believes d is believed
