单选题如果问题存在最优解，则下面几种搜索算法中，______必然可以得到该最优解。 A.深度优先搜索 B.广度优先搜索 C.有界深度优先搜索 D.启发式搜索

单选题下列不属于“竹林七贤”的是______。

单选题一般而言，幼儿在3岁以前主动控制排尿的能力较差，原因是______发育不健全。

单选题D What do you want to be when you grow up? A teacher? A doctor? How about an ice-cream taster? Yes, there really is a job where you can get paid to taste ice cream. Just ask John Harrison, an "Official Taste Tester" for the past 21 years. Testing helps manufacturers to be sure of a product's quality. During his career Harrison has been responsible for approving large quantities of the sweet ice cream——as well as for developing over 75 flavors (味道). Some people think that it would be easy to do this job: after all, you just have to like ice cream, right? No--there' s more to the job than that, says Harrison, who has a degree in chemistry. He points out that a dairy or food-science degree would be very useful to someone wanting a career in this "cool" field. In a typical morning on the job, Harrison tastes and assesses 60 ice-cream samples. He lets the ice cream warm up to about 12 °F. Harrison explains, "You get more flavor from warmer ice cream, which is why some kids like to stir it, creating ice-cream soup. " While the ice cream warms up, Harrison looks over the samples and grades each one on its appearance. "Tasting begins with the eyes," he explains. He checks to see if the ice cream is attractive and asks himself, "Does the product have the color expected from that flavor?" Next it' s time to taste ! Continuing to think up new ideas, try out new flavors, and test samples from so many kinds of ice cream each day keeps Harrison busy but happy-working at one "cool" job.

单选题下列叙述Ⅰ和Ⅱ均正确且有因果关系的是______。 选项 叙述Ⅰ 叙述Ⅱ ① NH 4 Cl为强酸弱碱盐 用加热法除去NaCl中的NH 4 Cl ② 溶解度：CaCO 3 ＜Ca(HCO 3 ) 2 溶解度：Na 2 CO 3 ＜NaHCO 3 ③ SiO 2 与HF反应 氢氟酸不能保存在玻璃瓶中 ④ Fe 3+ 具有氧化性 用KSCN溶液可以检验Fe 3+

单选题——What’S the woman? 一一 ?

单选题“玉米愿意长多高就长多高，它若愿意长上天去，也没有人管。”在《我和祖父的园子》一文中，作者萧红对园子里“蚂蚱、蜻蜓、蝴蝶”和“倭瓜、玉米、黄瓜”等形象描写，体现了作者浓厚的情感。下面说法正确的是______。 (1)对自由自在的向往和追寻 (2)对童年快乐生活的留恋 (3)对祖父给予的温暖与爱怀着永远的憧憬与追求 (4)对光阴的珍惜

单选题描述水的有关物理量之间关系的图象如下图所示，其中正确的是______。

单选题德育过程是对学生知、情、意、行的培养提高过程，在具体实施过程中应该______。

单选题下图是我国“嫦娥一号”传回的月球表面三维景观图。依据该图完成下列问题。

单选题More and more people like bicycling and it is no surprise. It is fun, healthy and good for the environment. Maybe that's why there are 1.4 billion bicycles and only 400 million cars on roads worldwide today. Bikes can take you almost anywhere, and there is no oil cost! Get on a bicycle and ride around your neighbourhooD. You may discover something new all around you. Stopping and getting off a bike is easier than stopping and getting out of your car. You can bike to work and benefit (受益) from the enjoyable exercise without polluting the environment. You don't even have to ride all the way. Folding (折叠) bikes work well for people who ride the train. Just fold the bike and take it with you. You can do the same on an airplane. A folding bike can be packed in a suitcase. You can also take a common bike with you when you fly. But be sure to look for information by getting on airline websites. Not all airlines are bicycle-friendly to travelers. Health Benefits of Bicycling. ·It helps to prevent heart diseases. ·Bicycling helps to control your weight. ·A 15-minute bike ride to and from work three times a week burns off five kilos of fat in a year. ·Bicycling can improve your mood (心情). ·Exercise like bicycling has been shown to make people feel better, more relaxed and self-confident. ·Bicycling is healthier than driving.

单选题下列能正确表示草原生态系统中草、鼠、蛇、鹰四种生物之间关系的食物链的是( )。

单选题“八音”乐器分类法的分类依据是______。

单选题想知道“目前世界上濒危动物华南虎的数量”，通过网上搜索得出不同的答案，以下比较可信的判断方法是( )。

单选题皮亚杰认为儿童心理发展有四个基本要素，即（　　）

单选题“蓬生麻中，不扶而直；白沙在涅，与之俱黑。”这句话体现影响个体身心发展的因素是______。

单选题三年级学生沈叶喜欢早晨和晚上学习需要记忆的知识，他认为早晚的学习效果优于白天，因早晚所受的干扰是______。 A.双重抑制 B.前摄抑制 C.单一抑制 D.倒摄抑制

单选题对教育发展规模和速度起决定性作用的是______。

单选题【2014．山东青岛】布鲁纳认为，无论我们选择何种学科，都务必使学生理解该学科的结构，以此建立的课程理论是( )。

单选题学校教学工作中的“学科设置与安排”体现于( )。