易燃液体大都本身或其蒸气具有（）性。A、毒害 B、稳定 C、刺激 D、放射 E、腐蚀

在“探究加速度与力、质量的关系”实验中，采用如图所示的实验装置．

（1）本实验采用的实验方法是______

A．控制变量法B．理想实验法

C．等效替代法D．实验推理法

（2）下列说法中正确的是______

A．在探究加速度与质量的关系时，应该改变拉力的大小

B．在探究加速度与外力的关系时，应该改变小车的质量

C．在探究加速度a与质量m的关系时，为了直观判断二者的关系，应作出a-

D．当小车的质量远小于砝码盘和砝码的总质量时，才能近似认为细线对小车的拉力大小等于砝码盘和砝码的总重力大小

E．平衡摩擦力时应将砝码盘及盘内砝码通过定滑轮系在小车上．

Every people has its own way of saying things, its own special expressions. Many everyday American expressions are on colors.

Red is a hot color. Americans often use it to express heat. They may say they are red hot about something unfair. When they are red hot they are very angry about something. The small hot tasting peppers found in many Mexican foods are called red hots for their color and their fiery taste. Fast loud music is popular with many people. They may say the music is red hot, especially the kind called Dixieland jazz.

Pink is a lighter kind of red. People sometimes say they are in the pick when they are in good health. The expression was first used in America at the beginning of the twentieth century. It probably comes from the fact that many babies are born with a nice pink color that shows that they are in good health.

Blue is a cool color. The traditional blues music in the United States is the opposite of red hot music. Blues is slow, sad and soulful. Duke Ellington and his orchestra recorded a famous song – Mood Indigo – about the deep blue color, indigo. In the words of the song: “You ain’t been blue till you’ve had that Mood Indigo.” Someone who is blue is very sad.

The color green is natural for trees and grass. But it is an unnatural color for humans. A person who has a sick feeling stomach may say she feels a little green. A passenger on a boat who is feeling very sick from high waves may look very green.

Sometimes a person may be upset because he does not have something as nice as a friend has, like a fast new car. That person may say he is green with envy. Some people are green with envy because a friend has more dollars or greenbacks. Dollars are called greenbacks because that is the color of the back side of the paper money.

The color black is used often in expressions. People describe a day in which everything goes wrong as a black day. The date of a major tragedy is remembered as a black day. A blacklist is illegal now. But at one time, some businesses refused to employ people who were on a blacklist for belonging to unpopular organizations.

小题1:If you had your wallet stolen while doing some shopping, you may call it        .

A．a white day

B．a black day

C．a red day

D．a green day小题2:Suppose a Mr. Brown says he is very happy because his three children are all in the pink, this means all his children are         .

A．lucky and wealthy

B．gentle and modest

C．fit and healthy

D．creative and energetic小题3:When she got home and found nothing had been done by her husband, Jane was really      .

A．red hot

B．green

C．blue

D．black小题4:In the following paragraph, the writer might tell the reader something about         .

A．unpopular polarizations in the world

B．people’ response towards a black day

C．the influence of the traditional blues

D．more words about color, such as brown

宽大也不是宽大无边，而是按《刑法》规定，对那些社会危害不大，能够认罪悔改的犯罪分子，实行宽大处理。( )

腿要怎么练才能踢高？

肺结核是一种传染性的肺部疾病。