问题
选择题
在化学反应A+B=C中，1.5g A与足量的B充分反应后生成9.5g C，则参加反应的B的质量为（ ）
A．3g
B．9.5g
C．8g
D．4g
答案
参加反应的B的质量为：9.5g-1.5g═8.0g．
故选C．
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在化学反应A+B=C中，1.5g A与足量的B充分反应后生成9.5g C，则参加反应的B的质量为（ ）
A．3g
B．9.5g
C．8g
D．4g
参加反应的B的质量为：9.5g-1.5g═8.0g．
故选C．
| 选择方框中的句子，补全对话。 | |
| Mother: Did you get your report card today, Mary? Mary: Uh-huh. Mother: So, 1.________________ Mary: I did OK in some subjects. Mother: What did your history teacher say? Mary: He said 2. ________________ Mother: That's not so good. How about English? Mary: Oh, Mr Sun said 3. _______________ Mother: That's nice. Mary: And Ms Chen said 4._______________ Mother: What does he teach again? Mary: She's my maths teacher. Mother: That's excellent. 5._______________ Mary: Oh, well, science is very hard. Mother: Yes, but what did your teacher say? Mary: Umm…she said I was lazy. Mother: Oh, Mary! You'll have to try harder at science.
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