下列属于人体非特异性免疫的第一道防线的是①胃液对病菌的杀灭作用 ②唾液中溶菌酶对病原体的分解作用 ③吞噬细胞的内吞作用 ④呼吸道纤毛对病菌的外排作用 ⑤皮肤的阻挡作用 ⑥效应T细胞与靶细胞接触 ⑦抗体与细胞外毒素结合
A：②⑤
B：④⑤
C：①②④⑤
D：②③⑤⑥⑦
下列说法中错误的是（ ）
She found ____ difficult to settle and calm down in the ____ place, because she was worried about whether they would be discovered.
There are five people here. __________ there are only four cups.
