题目

认真分析下图所示的实验装置，并回答下列问题： （1） 甲装置可用来验证光合作用需要若此装置需要一个对照实验，对照实验装置的水槽中应装有。 （2） 乙装置可用来验证，此装置必须放在的条件下。 （3） 丙装置可以用来验证实验前该装置中的试管内盛有澄清的石灰水，实验中的现象是。完形填空（共15 小题；每小题1 分，满分15 分）阅读下面短文，从短文后所给的四个选项中，选出可填入空白处的最佳选项。Many books have been written about“the art of giving”. And we also know that it’s hard to give people a gift, 【小题1】a personal one. If we want to make it better, we should understand who you will give the gift to and their likes and 【小题2】 As is often the case, some little kids think they don’t get enough gifts 【小题3】some old people think they get too many gifts. Different people like different kinds of gifts. Some presents are never too 【小题4】 For example, when a little child just gives his or her mother a leaf from a tree, it is enough to make her very 【小题5】 Gift giving is different in different 【小题6】Here are some of their likes. In Japan, people sometimes give special gifts. But they are not opened. Later, the same gift may be given away to someone 【小题7】because many people have enough things and don’t want 【小题8】 gifts themselves. In Canada, a tree can help remember 【小题9】In the USA, some people ask their families and friends to give money to charity rather than buying them gifts. In Sweden, doing something for someone is the best gift. People don’t need to 【小题10】too much money. Instead, making a meal for him or her is enough. To make things 【小题11】some people would rather just give money. In some cultures, however,【小题12】money can make people uncomfortable.“When someone gives me money, it just makes me think they’re being lazy,”says John Wilson.“In England, we have a saying: It’s the thought that 【小题13】When someone gives me money, I feel they don’t think it about at all. I prefer to receive a gift 【小题14】has some thought behind it.” Different people have very different thoughts 【小题15】this subject! So maybe the art of giving is difficult! What do you think? 【小题16】 A．specially B．especially C．commonly D．usually 【小题17】 A．displays B．disadvantages C．disagreements D．dislikes 【小题18】 A．while B．when C．as D．if 【小题19】 A．same B．similar C．small D．huge 【小题20】 A．lonely B．happy C．sad D．angry 【小题21】 A．cities B．towns C．provinces D．countries 【小题22】 A．else B．other C．another D．else’s 【小题23】 A．too much B．much too C．too many D．many too 【小题24】 A．a child B．a person C．a guide D．a chef 【小题25】 A．spend B．take C．cost D．make 【小题26】 A．more difficult B．easy C．difficult D．easier 【小题27】 A．using B．giving C．receiving D．fetching 【小题28】 A．counts B．discovers C．finds D．invents 【小题29】 A．who B．what C．where D．that 【小题30】 A．to B．on C．up D．in