What does the word "physical" in the first line mean in this passage？
A. Material.
Bodily.
C. Of physics.
D. Facial.
查看答案
中间纤维是由32条肽链构成的具有极性的结构。
A. 正确
B. 错误
The passage is written for all the purposes EXCEPT ______.
A. introducing music from all over the world
B. advertising Osaka Yusen Broadcasting
C. suggesting listening to Osaka Yusen Broadcasting
D. introducing a variety of radio channels
The author had trouble operating his VCR because______.
A. he had neglected the importance of using the timer
B. the machine had far more technical features than necessary
C. he had set about using it without proper training
D. its operation was far more difficult than the designer intended it to be
为了使肌细胞质膜去极化，肌质网(SR)中的Ca2+泵使用ATP水解释放的能量将Ca2+从SR的腔输往胞质溶胶，以启动肌收缩。
A. 正确
B. 错误
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