在催化剂参与反应过程时，在反应体系中增加了化学因素，从而改变_爱下问搜题

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问题单项选择题

在催化剂参与反应过程时，在反应体系中增加了化学因素，从而改变了反应的（），并有效地控制反应的方向。

A、速度

B、温度

C、压力

D、条件

答案

参考答案：A

完形填空

Tears went out of my eyes when I talked to my parents on the phone. What were they doing when I       them? This is what I want to know most. I had supper at five in the dining room. There is no need for me to cook and wash the dishes.       , now it is the        time for my parents. Dad works from seven in the morning to nine in the evening.       , all of the housework is        to my mum alone. She also has to work in the vineyard(葡萄园)        her own job.
Every day she        at 4 o’clock in the morning, and then works till dark. One day I called her at 7:30 in the evening. She told me she was        in the vineyard and hadn’t had supper yet. Tears ran down my cheeks.
Dear mum, I’ll study hard in the university because I am your       . I’ll look after myself because I am        to you. I promise you so much but I        want you to promise me you will tend yourself and Dad because you are like my blood. I cannot        without you.
Mum has ever said that the happiest time for Dad and her is when my sister and I come home. We play cards in the room, watch TV or do        else we like, with Dad and Mum        delicious food in the kitchen. It is        the happiest time for me. I could        all the difficulties and unhappiness. The        thing to do is to enjoy the time with my parents.
　　     , sometimes, doesnt need many words. Love your parents as they love you. Give them a        and tell them you        them.

D．Unfortunately

B．expectation

填空题

疟疾的传染源有（）、（）。