某辆汽车从静止开始做匀加速直线运动，加速度大小为0.5m/s2，达到30m/s时

条约必须遵守

慢性支气管炎与支气管哮喘最主要的鉴别症状是

A．咯血

B．咳嗽

C．哮喘

D．胸痛

E．发热

________ the help of her teacher, Mary ________ in the past few months.

A．With; has made progress

B．Under; has made a progress

C．With; had made progress

D．Under; had made a progress

阅读理解。

     根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多

于选项。

     The person behind you constantly kicks the back of your seat. Your talkative seatmate doesn't

understand your need for sleep. And the aircraft's bathroom is a total mess. These situations can make

even a short flight unbearable .Hopefully you don't cause these unpleasant experiences for others.  1  

     Always recline(向后倾斜) your seat slowly. There's nothing worse than suddenly being hit in the

knees by the seat in front of you. In addition, don't keep your seat reclined for the entire flight. Always

keep it upright during mealtimes. And remember to put it in the upright position before going to the

restroom (or anytime you leave your seat.)

       2  Wait until the meal is done and all the food trays (盘子)have been collected .It's hard for

passengers to stand up to let you pass when they still have their food trays. And when using the

bathroom .always clean up after yourself -the next user will be grateful !

     Keep your body-and your possessions-to yourself as much as possible so as not to crowd your

in-flight seatmate(s) .Share the armrest , especially on a long flight .Also, be careful not to kick or push

on the seat in front of you.

     While some people enjoy chatting with other passengers during a flight, not everyone does. Some

people may want to nap ,read or work.  3  

     If you are traveling with someone and want to chat, keep your voices low.   4   People can still hear

through your headphones if the volume is too high.

     When exiting the plane, if others are having trouble with their carry-on luggage .help them if you can.

If you can't help ,wait patiently, and don't push past people to get off the airplane.On your flight ,

remember the golden rule:   5   

A. Don't leave your carry-on in the aircraft.

B. If the conversation seems one-sided , you should notice it.

C. Treat others the way you want to be treated!

D. Avoid going to the bathroom during mealtimes.

E. Instead ,you can set an example by following these common airplane courtesies (礼貌).

F. It is not polite to talk loudly in the aircraft.

G. If using electronic gadgets (小装置), keep the volume down.

反映商业银行在一定时期内资产、负债和所有者权益各项目增减变化情况的报表是( )。

A．资产负债表
B．损益表
C．财务状况变动表
D．现金流量表