Which is the biggest and the deepest freshwater lake in the world（）
A. Lake Baikal
B. West Lake
C. Salt Lake
D. Blue Lake
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What type of writing is this text（）
A. an argumentation
B. a narrative
C. an exposition
D. None of theoptions
“It is the ability to do the job that matters, not where you come from or what you are.” What kind of sentence it is（）
A. emphatic sentence
B. complex sentence
One or two man-made satellites_in this country every year（）
A. have been sent up
B. are sent up
C. will send up
D. is sent up
属于外周免疫器官的是（）
A. 骨髓、黏膜相关淋巴组织B:胸腺、淋巴结、脾
B. C．胸腺、淋巴结、黏膜组织
C. D．骨髓、胸腺
D. E．脾脏、黏膜相关淋巴组织
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