Let's ____ the months of the year!
A. learn
B. to learn
C. learning
答案:A
连词成句。
1. nurse/a/She's/nice (.)
___________________________
2. This/brother/is/my (.)
3. the capital of/Tokyo/Japan/is (.)
4. beautiful/is/Hyde Park/very (.)
5. in the park/There/birds/are/many (.)
关于潜伏性感染,下列叙述哪项不正确?()
A.病原体潜伏于机体某些部位而不出现症状
B.机体免疫力下降时可引起显性感染
C.潜伏性感染是重要而危险的传染源
D.潜伏性感染仅见于部分传染病
E.疟疾、结核、单纯疱疹可有潜伏性感染