Which of the following is true about the World Digital Library according to the passage ?
A.A team at the Library of Congress in Washington developed its website alone.
B.Libraries and institutions in most countries have contributed to the library so far.
C.All documents and their explanations in the library are in seven official languages.
D.You can learn from the library about British politics and economy 1000 years ago.
第1题
地方性斑疹伤寒的传播媒介是A.人虱
B.鼠虱、鼠蚤
C.恙螨
D.蜱
E.蚊
流行性斑疹伤寒的传播媒介是A.人虱
B.鼠虱、鼠蚤
C.恙螨
D.蜱
E.蚊
Q热的传播媒介是A.人虱
B.鼠虱、鼠蚤
C.恙螨
D.蜱
E.蚊
恙虫病的传播媒介是A.人虱
B.鼠虱、鼠蚤
C.恙螨
D.蜱
E.蚊
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