墨家的“素丝说”说明了环境对人的发展起主要作用。

在Java中，属于整数类型变量的是 ( )

A．single

B．double

C．byte

D．char

Sean and Danielle were leaving the music store when they heard the crash. "What do you suppose that was?" asked Sean.

"I don't know for sure," said Danielle, "but it sure sounded bad. It's right over there. Let's go and look."

Sean and Danielle knew they would see an accident. But they didn't know what to expect. There in the middle of the street was a bicycle that had been hit by a car. The bicycle rider was sitting in the street, shaking his head.

"Look at that," said Sean, "he's not even wearing a helmet. He is one lucky guy".

"No kidding," Danielle replied. "Look at the driver of the car. She's just as lucky. She's not wearing a seat belt.

Sean and Danielle are right. The bicycle rider is very lucky, he was not hurt. Riding a bicycle is a lot of fun, but it can also be very dangerous. You have to pay attention all the time to what you're doing. You also have to follow safety rules.

When you ride a bicycle, remember that you share the road with cars and trucks. These vehicles are a lot bigger than you are. So, always wear a helmet when riding your bicycle. Always means "every time" even if you are just riding around the block.

Follow the same rules as car and truck drivers. Bicycle riders also have some special rules. Here are some special rules you should follow:

● Do not ride your bicycle on the sidewalk. By not riding on the sidewalk, you won't run into a pedestrian.

● Ride on bike paths or trails when they are available.

● Always ride in the same direction as traffic.

● Always ride on the right-hand side of the road.

● When you ride with a friend, do not ride next to each other. Ride in single field, one behind the other.

● Obey all traffic signals and signs. Stop at all stop signs.

● Walk your bicycle across busy crossings.

● Be sure to use hand signals when you turn and stop.

Follow these safety rules when riding a bicycle at night.

● Have a headlight that works.

● Have these reflectors on your bicycle: yellow or white in front, and red ones on the pedals and back.

● Wear light-colored clothing so drivers can see you.

You should always keep your bicycle in good working order. Make sure the brakes work properly and that your tires have enough air. If you find anything wrong with your bike, fix it or have it fixed before you ride it again.

小题1:How did Sean and Danielle know that they would see an accident?

A．They saw somebody falling off the bike.

B．They heard the sound of the crash.

C．They were asked to offer some help.

D．They remembered what might happen.小题2:What Sean and Danielle saw in the middle of the street __________.

A．were a bicycle, the rider, a car and the driver

B．was a bicycle under the damaged car

C．was a car without safe belt and the helmet

D．surprised both the rider and the car driver小题3:Why did Sean and Danielle consider the rider and the driver lucky?

A．Because the bicycle and the car were lost.

B．Because the rider didn’t wear his helmet.

C．Because they both were not badly hurt.

D．Because the driver didn’t wear the seat belt.小题4: From the passage, we learn that _________.

A．carelessness can result in accidents

B．we can’t ride bicycles in the street

C．the driver was quite rude to the rider

D．the bicycle rider was sent to hospital小题5:Which of the following breaks the rules for a safe bicycle riding?

A．Get off your bicycle and walk across busy crossings.

B．Follow the safety rules as the car and truck drivers do.

C．Fix light reflectors to your bicycle when riding at night.

D．Ride next to other riders, but not too close to each other

下列哪个药物不具有利尿作用（）

A.依他尼酸

B.氨苯蝶啶

C.非诺贝特

D.呋噻米

E.氯噻酮

下列与水污染相关的疾病是（）

A.艾滋病

B.食物中毒

C.甲肝

D.登革热

在孵化期中的后半期必须进行凉蛋的家禽有（）。

A、鸡

B、鸭

C、鹅

D、鸽