________ three whole years working on the design of the equipment.
A. It took the chief engineer
B. The chief engineer spent
C. The chief engineer took
D. It cost the chief engineer
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Did you ask the teacher ________ the day before?
A. what was happened to her
B. what she had happened
C. what she happened
D. what had happened to her
Jane has ________ uncle and he is now staying in ________ European country.
A. an; an
B. an; the
C. an; a
D. a; the
可兴奋细胞包括
A. 神经细胞、骨细胞
B. 神经细胞、肌细胞
C. 神经细胞、腺细胞
D. 神经细胞、肌细胞、腺细胞
E. 神经细胞、骨细胞、上皮细胞
反馈信息是指
A. 控制部分发出的信息
B. 受控变量改变的情况
C. 外界干扰的强度
D. 调定点的改变
E. 中枢的紧张性
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