题干

下列有关反应限度的说法正确的是( )

A:大多数化学反应在一定条件下都有一定的限度

B:NH4HCO3受热分解可自发进行:

C:使用催化剂,可降低反应的活化能,加快反应速率,改变反应限度

D:FeCl3与KSCN反应达到平衡时,向其中滴加KCl溶液,则溶液颜色变深

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A

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    Seven years ago, I began accompanying my father to the local market to sell vegetables we harvested from our farm. At the beginning , I did what I could to1him while I also communicated with other participants in the market.

    As time went by, I increasingly2the craft of gardening,3I began planting a garden of my own to4a seller myself. The market soon became my5for many summers to come. The sellers in the market were6and more than willing to share their gardening experience. Many sellers were the new generation of farmers and acquired knowledge through the experience of their7. The years I participated in the market helped me grow, taught me many new skills and opened doors to success I8imagined.

    Responsibility came rather quickly as I 9to manage my own gardening business. There was a huge of work being self10. I had to do everything by myself. I learned that self-discipline(自我约束) and time management were important in order to11a productive garden. Rising 12in the morning at 4 a. m. to arrive at the market with my13produce ensured I would be there to greet early 14 .

    The market opened a door of opportunity I never dreamed of. It15me to make a profit to start a greenhouse business. It is a(n)16feeling when I see the seeds come out and raise them as they continue to17until they are ready for sale. I've learned18because it is impossible to rush Mother Nature! It takes time and work to make the plants grow and become mature. It is not an overnight19. Several weeks are required for the plants to be ready, but the 20is worth all the time I spend and all work I do.