题目

有关原生演替和次生演替的叙述，正确的是（ ） A．沙丘、火山岩上进行的是原生演替，冰川泥、弃耕的农田上进行的演替是次生演替B．原生演替形成的群落内无竞争现象，次生演替形成的群落内竞争明显C．原生演替所需时间较长，次生演替所需时间较短D．原生演替能形成森林，次生演替很难形成森林句型转换。1. He hit his leg on a table, _______ _______? (完成反意疑问句) 2. It won't rain next Monday. We'll have a picnic. (改成含条件状语从句的复合句)     We'll have a picnic if it ______ _______ next Monday. 3. Mr Brown went home after the rain stopped. (改为同义句)     Mr Brown _______ go home until it stopped _______.4. The monkey is very clever. (改为感叹句)    _______ ________ the monkey is! 5. My father will take me to our hometown next month. (对画线部分提问)     _______ _______ your father take you next month?