The ship's generator broke down, and the pumps had to be operated ______ instead of mechanically.
A. automatically
B. artificially
C. superficially
D. manually
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从( )起，海关启用了新版的《进(出)口货物报关单》。
A. 1994年1月1日
B. 1997年1月1日
C. 1998年1月1日
D. 1996年1月1日
金黄色葡萄球菌对青霉素易产生耐药，主要原因是
A. 细胞膜通透性改变
B. 产生钝化酶
C. 产生水解酶
D. 代谢途径改变
E. 产生与药物有拮抗作用的物质
According to the passage, which is NOT true to Johnson.'
A. He once did not have enough money to live on.
B. He lived singly in the past.
C. He was a littlie cynical.
D. He received little care from his friends.
The purpose of the passage is to ______.
A. analyze the possible causal links between Tibetan ecology and society
B. describe the social organization of typical Tibetan villages
C. describe Tibetan fauna and flora
D. analyze the mysterious of the sudden appearance of the Himalayas
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