题干

如图为某反应的部分微观示意图,其中不同的球代表不同元素的原子.下列说法正确的是(   )

A:该反应属于化合反应

B:参加反应的两种分子个数比为1:1

C:各元素的化合价在反应前后未改变

D:1个X分子中有3个原子

上一题 下一题 0.0难度 选择题 更新时间:2019-07-12 12:46:24

答案(点此获取答案解析)

D

同类题2

短文续写

    Dad pushed his finger into my basket. “What's that?”he asked. “Mew, ”said the basket.

    Dad suddenly pulled his hand away. “Oh no,” he said. “Not a cat. No way. ”

    I pulled Checkers from the basket. “It's not a cat. It's a kitten. Can I keep him? Please?”

    Dad frowned for a minute, thinking. Then he rubbed Checkers under the chin(下巴). “You'll have to take good care of him. ”

    I hugged Checkers. “I will, “I promised, he won't be any trouble at all.” And Checkers wasn't—until he grew into a cat. He wanted to be the first one in the house- and the first one out of the house. Sometimes he blocked dad in the way. “That cat!”Dad complained. Checkers climbed onto our roof. He had no trouble getting down. Usually he aimed for Dad. “That cat!” Dad yelled. Checkers flushed the toilet and watched the water circle away. “That cat!”Dad was almost mad. Checkers hid in strange places. He liked to surprise people.

    One day he hid under the couch(睡椅). Dad walked by with a glass of orange juice. Checkers jumped out. He curled around Dad's ankle and attacked Dad's toes. Orange juice spilt all over the floor. Dad yelled and put Checkers outside. “Get out of my way, cat!” he said angrily. And he slammed the door.

    Dad washed the injured toes and peeled open a bandage. He wrapped it around his big toe, and then he opened four more for his ankle.

    I watched from the window. Checkers looked frustrated as he walked down the road.

    “I'm sorry Checkers scratched you, ”I said. “He was just playing. He didn't mean to hurt you.”

    “Don't worry, ”said Dad. “That cat will be back. ”

    After supper I called for Checkers. But Checkers didn't come. Nighttime came. I called and called. I knocked his food dish with a spoon loudly. But still no Checkers. I left the porch light on. But the next morning Checkers still wasn't there.

    I carried a picture of Checkers to all the neighbors. I drew posters and hung them all over. But nobody found Checkers.

    Days went by. Life wasn't the same without that cat. I was angry with Dad. I didn't think he missed Checkers at all.

    Then one night the phone rang.



    Dad nodded, his face turning red.

注意:1.所续写的短文词数应为150左右;2.应使用5个以上短文中标有下划线的关键词语;3.续写部分分为二段,每段的开头语已经为你写好;4.续写完成后,请用下划线标出你所使用的关键词语。