环渤海地区是我国经济发展较快的地区之一。下图中,濒临渤海的省区有
①北京②天津③河北④山东⑤辽宁[ ]
A.①②③
B.①③④
C.④⑤
D.②③④⑤
答案:D
He made a promise that he would ________ us with dinner the next day, but he broke his word.[ ]
A.give
B.offer
C.entertain
D.equip
中度中毒()
A.血胆碱酯酶活力降至30%以下
B.血胆碱酯酶活力降至30%~50%
C.血胆碱酯酶活力降至50%~70%
D.血胆碱酯酶活力降至60%~80%
E.血胆碱酯酶活力降至70%~90%