下列安全标志牌的含义中正确的是()?
A.前方有隧道,因此减速慢行
B.前方有坡路,因此减速慢行
C.前方有减速路障,因此减速慢行
D.前方路面不平,因此减速慢行
参考答案:D
阅读填词。
Li Mei is a Chinese girl, but she's in the USA now. She's six 1______ old. One day her mother says
2______ her:"Now you're six. You 3______ go to school." Li Mei 4______ to school 5______ her mother
every day. She 6______ hard. "I have a new 7______, Mum." Li Mei says, "Her 8______ is Joy. She's
English. But her parents are in 9______."
"Can she speak Chinese?" Mum asks.
"Yes, but a 10______."
人感染日本血吸虫产生的免疫为 ()
A.带虫免疫
B.伴随免疫
C.体液免疫
D.细胞免疫
E.以上都不是