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【单选题】
用98 ％的浓硫酸(密度为1.84 g/cm 3 )配制100 mL l mol/L的稀硫酸。现给出下列仪器(配制过程中可能用到)：①100 mL量筒②10 mL量筒③50 mL烧杯④托盘天平⑤100 mL容量瓶⑥胶头滴管⑦玻璃棒，按使用仪器的先后顺序排列正确的是A.
④③⑦⑤⑥
B.
②⑤⑦⑥
C.
①③⑤⑥⑦
D.
②⑥③⑦⑤⑥
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【简答题】Passage Two Questions 1 to 5 are based on the following passage. Having borne for years the stigma of being one of the most disconnected countries in the world, Cuba is now expanding access to digital...
【单选题】Increasing numbers of parents in the U.S. are choosing to teach their kids at home. In fact, the U.S. Department of Education estimated that, in 1999, around 850,000 children were being homeschooled. ...
A.
Teacher shortages and lack of funding.
B.
Escalating classroom violence.
C.
Large class and problems inside the classroom.
D.
Dissatisfaction with the educational system.
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