第一次电击除颤后首先做()
A.评估心率
B.继续胸外按压
C.推注药物
D.人工通气
E.测量血压
参考答案:B
1935年,英国生态学家()首次提出生态系统的概念。
A.勒特
B.海克尔
C.奥德姆
D.坦斯列
After he graduated from college, he _______ his father’s business.
A.took in
B.took up
C.took over
D.took on