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【判断题】
所有的活细胞都有细胞膜、细胞质和细胞核。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】At time t = 0.00 s, a car is traveling along a straight line at a speed of 20 m/s with constant acceleration. The car travels 56.0 m during the time interval between t = 2.00 s and t = 4.00 s. What...
A.
14.0 m/ s 2
B.
7.00 m/ s 2
C.
5.33 m/ s 2
D.
2.67 m/ s 2
【简答题】Traveling can be expensive, (1) _____________. At some points everyone needs to take a break from (2) _________________. Whether you stay at home, take a car trip to Grandma’ s house, or (3) _________...
【单选题】1 On average, Americans spend just over 32 hours a week listening to music in 2017, up 5.5 hours over last year. How is this possible? Technology. At home, at work and traveling in between, people are...
A.
Personalized music tech.
B.
Smartphones, laptops, and tablets.
C.
Voice-controlled devices.
D.
High-end specialized headphone.
【单选题】1 On average, Americans spend just over 32 hours a week listening to music in 2017, up 5.5 hours over last year. How is this possible? Technology. At home, at work and traveling in between, people are...
A.
32.1 hours
B.
26 .6 hours
C.
23.5 hours
D.
38.5 hours
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