题目

在探究“固体熔化过程的规律”实验中，实验装置如图所示. （1） 组装如图甲的实验装置，操作时将实验研究的固体放入大试管中，并用“水浴法”加热.用“水浴法”并配备搅拌棒的目的是.有同学提出，不用“水浴”法加热，直接用酒精灯加热.你认为这一方法（选填“可行”或“不可行”），原因是. （2） 小强小组实验时发现固体熔化时间短，不便于观察熔化时的实验现象和记录实验数据，在不改变原来实验装置的情况下，请你告诉他5、Stepping into a pool of water is common enough, but who could ever imagine stepping into a pool of fish? In February of 1974, Bill Tapp, an Australian farmer, saw a rain of fish that covered his farm．How surprised he must have been!     What caused this strange occurrence? This is a question that had long puzzled people who study fish．The answer turned out to be a combination of wind and storm．       When it is spring in the northern part of the world, it is fall in AustraliA．Throughout the autumn season, terrible storms arise and rains flood the land．The strong winds sweep over Australia like huge vacuum cleaners （吸尘器）, collecting seaweed, pieces of wood, and even schools of fish．Strong winds may carry these bits of nature for many miles before vacuum dropping them on fields, houses, and astonished people．     Although they seem unusual, fish-falls occur frequently in Australia．When Bill Tapp was asked to describe the scene of fish, he remarked, “They look like millions of dead birds falling down．” His statement is not surprising．The wonders of the natural world are as common as rain．Nature, with its infinite wonders, can create waterfalls that flow upward and fish that fall out of the sky． 1．What could be the feelings of Bill Tapp the moment he saw the rain of fish?        A．excited         B．scared         C．calm           D．amazed 2．Fish-falls occur in Australia ________．      A．quite often                                     B．on large farms        C．only in winter                                    D．when the air is calm 3．The word “infinite” is closest in meaning to _________．      A．easy                                          B．difficult        C．countless                                       D．dangerous 4．What might be the reasons of the rain of fish?        A．Vacuum cleaners                               B．Strong wind        C．Wind and storm                                D．It is still a puzzle 5．What is this passage about?        A．A sad story．                            B．Australia's northern part．        C．A rain of fish．                           D．The damage done by floods．