His _____ English is very good, because

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问题选择题

His _____ English is very good, because he is from Australia, an _____ country.

答案

答案：C

略

选择题

现在下列仪器：①托盘天平、②烧杯、③药匙、④玻璃棒、⑥水槽、⑦量筒，配制一定质量分数的食盐溶液时，应选用的仪器是[ ]

A．①②③④

B．①②⑤⑦

C．①②④⑤⑦

D．③③④⑤⑦

填空题

补体系统的激活途径，分为（）途径与（）途径。