问题
单项选择题
40gNaOH溶解在120g水中其质量浓度为()。
A、33.3%
B、25%
C、67%
D、75%
答案
参考答案:B
40gNaOH溶解在120g水中其质量浓度为()。
A、33.3%
B、25%
C、67%
D、75%
参考答案:B
五位母亲Betty, Sara, Gina, Mary和 Alice打算为各自的孩子选择一所合适的学校。请仔细阅读下列各题中的个人情况说明,从A到F的六个选项中,选出符合各人要求的最佳选项,其中一项为多余选项。 小题1: Betty has a six-year-old daughter. She wants her to be a musician when she grows up, so she is looking for a famous music school for her. 小题2: Sara’s son is 10 years old. He is interested in water sports. He said that he hoped to be a sailor in the future. 小题3: Alice learned to dance when she was young. Now she is a successful dancer. She wants her little daughter to follow her steps. 小题4: Mary is always worried about her daughter, who is poor at math and English at school, so she is looking for a training centre to help her daughter. 小题5:Gina has a son who is a football fan. He knows about almost all the well-known football players. He wishes to be a football star.
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