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【单选题】
机会致病寄生虫是指A.
偶尔感染的寄生虫
B.
暂时寄生的寄生虫
C.
随机感染的寄生虫
D.
通常处于隐性感染状态,免疫功能低下时致病的寄生虫
E.
免疫功能正常时致病的寄生虫
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【单选题】在美丽的白沙椰岛菲律宾长滩岛有一种船因为长得像螃蟹，当地导游俗称其为螃蟹船，这种船之所以被俗称螃蟹船是因为（ ）。
A.
船体由相似的两只独木舟拼接而成
B.
船体两侧安装了舷外平衡支架
C.
船体只能横向行动，像螃蟹
【简答题】Every time she went to a dance, she would always ____ to the nines. Since 1978 China has been going through ____ economic growth. In our phone interview she told me her ____ story. Don't ____. It's ti...
【简答题】She told me that she was still ______ her former roommate and they wrote a couple of letters to each other every year. (pave the way for /echo in one's mind /be supportive of /in contact with)
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