题海网，海量题库；找题库、找试卷、找答案就上题海网。

如果一个人的食物有1/2来自绿色植物，1/4来自小型肉食性动物，1/4来自羊肉。假如能量传递效率为10%，那么该人每增加1千克体重，约消耗植物（   ）

根据对话内容及所给首字母提示，补全所缺单词。

A: Nice to meet you, Mr. Hand.

B: Nice to meet you, t.

A: You look young, Mr. Hand. 

B: Thank you! I think that's b I have a healthy life.

A: Well, I think so. What healthy h do you have?

B: I get up early and go to bed early. I often play sports and eat healthy f.

A: Great! Do you smoke (吸烟)?

B: No, I n smoke. It's unhealthy.

A: That's right. 

近代时期，在清政府被迫签订的不平等条约中，首次出现允许外国人在中国通商口岸开设工厂条款的是（     ）

由一个电源、两个小灯泡、一个电键和几根导线连接成一个电路．当断开电键时，两个灯泡都不发光；闭合电键，两个灯泡都发光，则下面说法中正确的是()

G20杭州峰会向世界展示了中国风采，文艺晚会以江南韵味惊艳世界，呈现了中国文化，更彰显了中国的文化自信。这是因为中华文化（    ）

①博大精深、源远流长               ②是世界上最优秀的文化

③是中华民族的“根”                    ④推动了世界文化的发展

查阅某地区的等高线地形图，发现一局部如下图所示，等高距为50米，则a等高线代表的数值是（    ）

画图表示下面算式的意思。

2+3=5

— What do you think of the news?

—The news ________ terrible. But we are ________ in it.

2008年我区部分居民用上了燃气公司提供的天然气，代替原来使用的煤或液化石油气，对我市的环境起了一定的改善作用。回答下列问题：

如图所示，甲图是x-t图像，乙图是v-t图像，图中给出的四条曲线1、2、3、4，分别代表四个不同物体的运动情况，关于它们的物理意义，下列描述正确的是（   ）

鸡的性别决定方式属于ZW型，现有一只纯种雌性芦花鸡与一只纯种雄性非芦花鸡交配多次，F₁中雄性均为芦花性状，雌性均为非芦花性状。据此推测错误的是（    ）

If you try your best, you can find the secret (easy).

小明在“测平均速度的实验”中，设计了如图所示的实验装置：

在下列物质中，能够导电的电解质是（   ）

Show me _________________ markers.

CPU（中央处理器）是手机最核心的零部件，美国高通公司的骁龙处理器占据我国手机44%左右的市场份额。据此完成下面小题。

阅读理解

    Zach Bonner, a teenage boy, has just walked a long journey, more than 1, 200 miles from his home town in Tampa, Florida, to the nations capital, Washington, DC, with the aim to raise awareness and funds for homeless kids.

    In the final leg of the trip, Zach has traveled about 10 miles every day. Along the way, he has collected more than1.000 letters about homeless children. He hopes to give the letters to the President. Zach says he hopes his journey can make a difference.

    More than one million children in the United States live in shelters or on the streets. In order to know the difficulties that homeless children face, Zach spent 24 hours with a group of them every day during his long journey.

    On June 3. Zach walked the last mile of his long journey. More than 500 supporters, including 300 homeless kids joined Zach. "It was a long walk," Zach said, "but it was well worth it."

    Zach's idea came from a movie about Mildred Norman, who tried to promote world peace by walking 25,000 miles. Zach considered walking as a good way to draw public attention to his cause.

    Zach is also the founder of the Little Red Wagon Foundation, whose purpose is to help needy young people. Through the foundation, Zach has raised money and donated school supplies. "A lot of homeless youth don't get the chance to succeed in school because they don't have supplies."

    Zach's volunteerism has even inspired a Hollywood movie based on his life. "He is the most extraordinary kid I've ever met "says Michael Guillen, who has made the movie." He hasn't just talked the talk. He has walked the walk."

    Difficult and tiring as the journey was, Zach was never discouraged in his walking. "When homeless kids get tired of being homeless, they don't give up. So why should I quit when I get tired of walking?"

带有病原微生物的飞沫核（直径大于0.000007米），在空气中短距离(1米内）移动到易感人群的口、鼻黏膜或眼结膜等导致的传播称为飞沫传播，其中0.000007用科学记数法可表示为 .

绿色植物直接或间接是其它生物的食物.（判断对错）

下列重要的经纬线穿过我国的是：