下列各组分泌腺产生的分泌物，均直接排放到内环境的是（）
A.唾液腺、垂体、肠腺
B.肾上腺、甲状腺、胰岛
C.睾丸、汗腺、皮脂腺
D.卵巢、胃腺、肝脏
参考答案：B
解析：
唾液腺分泌的唾液进入消化道，肠腺分泌的物质进入消化道；A错。肾上腺、甲状腺、胰岛分泌的物质进入内环境；B正确。汗腺和皮脂腺的分泌物到外界环境；C错。胃腺分泌的物质进入消化道；D错。
考点：本题考查内环境中的成分，意在考查知识的识记能力。
| 根据题意从方框中选择单词并用其正确形式完成句子。 | |
—No, I didn't watch it. 2. Tim is an athletic boy. He exercises _______ a week. 3. Good boy. You always come in time.So it's ________ to see you come late. 4. I like English very much. And I am  pretty________ at it. 5. She wants to a reporter because she _________ talking with people. |