2．What has an effect on people most?

　　A．Raising heads to others.

　　B．Doing something casually.

　　C．Meeting in the school corridor.

　　D．The simple act of saying "Hello"．

　　答案与解析：D　考查细节理解。根据第二段第二句"Still, on a smaller range, the simple act of saying'Hello' to someone can make a lot of difference"可知，对别人影响最大的是打招呼这种简单的行为。

　　3．Why do some people feel lonely?

　　A．They are unwilling to communicate with others.

　　B．They are too shy to communicate with others.

　　C．They are very fond of living alone.

　　D．They don't like doing things as others do.

　　答案与解析：B　考查推理判断。根据第四段中的"Many people are lonely because they're shy... cut off"可知，一些人感到孤独的原因是他们太害羞了，不敢和别人交流。

　　4．What can we learn from the last paragraph?

　　A．We should neglect a small thing.

　　B．Saying "Hello" to others is powerful.

　　C．The flowers make the world better.

　　D．No one is better than Joseph Joubert.

　　答案与解析：B　考查推理判断。根据最后一段中的"A'Hello' to a stranger is a small thing, and often neglected(忽视), but through it we can make the world better for another person"可知，向别人打招呼是有影响力的。

　　B

　　[2019·陕西检测二]Whenever I hear a recording of John Denver singing"Sunshine on My Shoulders"， I find myself smiling, drawn to a love of the sun and the outdoors I've had for years as a Michigan native. Walking barefoot to the lake, playing without shirts in the sunlight, and breathing fresh air feel good. As a doctor I can tell you they are also good for your heart.

　　Studies have found higher rates of high blood pressure among people with the lowest sun exposure. One reason may be due to nitric oxide (一氧化氮), a gas whose function is activated when your skin is exposed to the sun's rays. It reduces both heart attack and stroke risks. Vitamin D, which sunlight helps your body produce, is also linked to better health. So walk outdoors for 15 to 30 minutes daily.

In Japan, walking through forests to keep healthy has become a